1) Fix singletons

2) Fix modals.

src/Squidex.Domain.Apps.Entities/Contents/Guards/GuardContent.cs

@@ -5,7 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
 using NodaTime;
 using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Entities.Contents.Commands;
@@ -25,7 +24,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guards
                 ValidateData(command, e);
             });
 
-            if (schema.IsSingleton && command.ContentId != Guid.Empty)
+            if (schema.IsSingleton && command.ContentId != schema.Id)
             {
                 throw new DomainException("Singleton content cannot be created.");
             }

src/Squidex.Domain.Apps.Entities/Contents/SingletonCommandMiddleware.cs

@@ -30,7 +30,7 @@ namespace Squidex.Domain.Apps.Entities.Contents
 
                 var data = new NamedContentData();
 
-                var contentId = Guid.Empty;
+                var contentId = schemaId.Id;
                 var content = new CreateContent { Data = data, ContentId = contentId, SchemaId = schemaId, Publish = true };
 
                 SimpleMapper.Map(context.Command, content);

src/Squidex/app/features/administration/pages/event-consumers/event-consumers-page.component.ts

@@ -9,7 +9,7 @@ import { Component, OnDestroy, OnInit } from '@angular/core';
 import { Subscription, timer } from 'rxjs';
 import { onErrorResumeNext, switchMap } from 'rxjs/operators';
 
-import { ModalView } from '@app/shared';
+import { DialogModel } from '@app/shared';
 
 import { EventConsumerDto } from './../../services/event-consumers.service';
 import { EventConsumersState } from './../../state/event-consumers.state';
@@ -22,7 +22,7 @@ import { EventConsumersState } from './../../state/event-consumers.state';
 export class EventConsumersPageComponent implements OnDestroy, OnInit {
     private timerSubscription: Subscription;
 
-    public eventConsumerErrorDialog = new ModalView();
+    public eventConsumerErrorDialog = new DialogModel();
     public eventConsumerError = '';
 
     constructor(

src/Squidex/app/features/apps/pages/apps-page.component.ts

@@ -11,7 +11,8 @@ import { take } from 'rxjs/operators';
 import {
     AppsState,
     AuthService,
-    ModalView,
+    DialogModel,
+    ModalModel,
     OnboardingService
 } from '@app/shared';
 
@@ -21,10 +22,10 @@ import {
     templateUrl: './apps-page.component.html'
 })
 export class AppsPageComponent implements OnInit {
-    public addAppDialog = new ModalView();
+    public addAppDialog = new DialogModel();
     public addAppTemplate = '';
 
-    public onboardingModal = new ModalView();
+    public onboardingModal = new ModalModel();
 
     constructor(
         public readonly appsState: AppsState,

src/Squidex/app/features/content/pages/content/content-page.component.html

@@ -44,7 +44,7 @@
                     </button>
 
                     <ng-container *ngIf="content.isPending || !schema.isSingleton">
-                        <div class="dropdown-menu" *sqxModalView="dropdown" [sqxModalTarget]="optionsButton" @fade>
+                        <div class="dropdown-menu" *sqxModalView="dropdown;closeAlways:true" [sqxModalTarget]="optionsButton" @fade>
                             <ng-container *ngIf="content.isPending">
                                 <a class="dropdown-item" (click)="discardChanges()">
                                     Discard changes

src/Squidex/app/features/content/pages/content/content-page.component.ts

@@ -24,7 +24,7 @@ import {
     ImmutableArray,
     LanguagesState,
     MessageBus,
-    ModalView,
+    ModalModel,
     SchemaDetailsDto,
     SchemasState,
     Version
@@ -52,7 +52,7 @@ export class ContentPageComponent implements CanComponentDeactivate, OnDestroy,
     public contentVersion: Version | null;
     public contentForm: EditContentForm;
 
-    public dropdown = new ModalView(false, true);
+    public dropdown = new ModalModel();
 
     public language: AppLanguageDto;
     public languages: ImmutableArray<AppLanguageDto>;

src/Squidex/app/features/content/pages/contents/contents-page.component.ts

@@ -16,7 +16,7 @@ import {
     ContentsState,
     ImmutableArray,
     LanguagesState,
-    ModalView,
+    ModalModel,
     SchemaDetailsDto,
     SchemasState
 } from '@app/shared';
@@ -35,7 +35,7 @@ export class ContentsPageComponent implements OnDestroy, OnInit {
 
     public schema: SchemaDetailsDto;
 
-    public searchModal = new ModalView();
+    public searchModal = new ModalModel();
 
     public selectedItems:  { [id: string]: boolean; } = {};
     public selectionCount = 0;

src/Squidex/app/features/content/pages/contents/search-form.component.ts

@@ -8,7 +8,7 @@
 import { ChangeDetectionStrategy, Component, EventEmitter, Input, OnChanges, Output } from '@angular/core';
 import { FormBuilder, FormControl } from '@angular/forms';
 
-import { ModalView } from '@app/shared';
+import { ModalModel } from '@app/shared';
 
 @Component({
     selector: 'sqx-search-form',
@@ -40,7 +40,7 @@ export class SearchFormComponent implements OnChanges {
 
     public contentsFilter = new FormControl();
 
-    public searchModal = new ModalView();
+    public searchModal = new ModalModel();
     public searchForm =
         this.formBuilder.group({
             odataOrderBy: '',

src/Squidex/app/features/content/shared/assets-editor.component.ts

@@ -15,7 +15,7 @@ import {
     AssetDto,
     AssetsService,
     ImmutableArray,
-    ModalView,
+    ModalModel,
     Types
 } from '@app/shared';
 
@@ -35,7 +35,7 @@ export class AssetsEditorComponent implements ControlValueAccessor {
     private callChange = (v: any) => { /* NOOP */ };
     private callTouched = () => { /* NOOP */ };
 
-    public selectorModal = new ModalView();
+    public assetsDialog = new ModalModel();
 
     public newAssets = ImmutableArray.empty<File>();
     public oldAssets = ImmutableArray.empty<AssetDto>();
@@ -96,7 +96,7 @@ export class AssetsEditorComponent implements ControlValueAccessor {
             this.updateValue();
         }
 
-        this.selectorModal.hide();
+        this.assetsDialog.hide();
     }
 
     public onAssetRemoving(asset: AssetDto) {

src/Squidex/app/features/content/shared/content-item.component.html

@@ -86,7 +86,7 @@
         <button type="button" class="btn btn-link btn-secondary" (click)="dropdown.toggle(); $event.stopPropagation()" [class.active]="dropdown.isOpen | async" #optionsButton>
             <i class="icon-dots"></i>
         </button>
-        <div class="dropdown-menu" *sqxModalView="dropdown" [sqxModalTarget]="optionsButton" @fade>
+        <div class="dropdown-menu" *sqxModalView="dropdown;closeAlways:true" [sqxModalTarget]="optionsButton" @fade>
             <a class="dropdown-item" (click)="publishing.emit(); $event.stopPropagation()" *ngIf="content.status === 'Draft'">
                 Publish
             </a>

src/Squidex/app/features/content/shared/content-item.component.ts

@@ -14,7 +14,7 @@ import {
     fadeAnimation,
     FieldFormatter,
     fieldInvariant,
-    ModalView,
+    ModalModel,
     PatchContentForm,
     RootFieldDto,
     SchemaDetailsDto,
@@ -70,7 +70,7 @@ export class ContentItemComponent implements OnChanges {
 
     public patchForm: PatchContentForm;
 
-    public dropdown = new ModalView(false, true);
+    public dropdown = new ModalModel();
 
     public values: any[] = [];
 

src/Squidex/app/features/content/shared/contents-selector.component.ts

@@ -12,7 +12,7 @@ import {
     ContentDto,
     LanguageDto,
     ManualContentsState,
-    ModalView,
+    ModalModel,
     SchemaDetailsDto
 } from '@app/shared';
 
@@ -37,7 +37,7 @@ export class ContentsSelectorComponent implements OnInit {
     @Output()
     public selected = new EventEmitter<ContentDto[]>();
 
-    public searchModal = new ModalView();
+    public searchModal = new ModalModel();
 
     public selectedItems:  { [id: string]: ContentDto; } = {};
     public selectionCount = 0;

src/Squidex/app/features/content/shared/due-time-selector.component.ts

@@ -8,7 +8,7 @@
 import { Component } from '@angular/core';
 import { Observable, Subject } from 'rxjs';
 
-import { fadeAnimation, ModalView } from '@app/shared';
+import { DialogModel, fadeAnimation } from '@app/shared';
 
 @Component({
     selector: 'sqx-due-time-selector',
@@ -19,7 +19,7 @@ import { fadeAnimation, ModalView } from '@app/shared';
     ]
 })
 export class DueTimeSelectorComponent {
-    public dueTimeDialog = new ModalView();
+    public dueTimeDialog = new DialogModel();
     public dueTime: string | null = '';
     public dueTimeFunction: Subject<string | null>;
     public dueTimeAction: string | null = '';

src/Squidex/app/features/rules/pages/rules/rules-page.component.ts

@@ -10,7 +10,7 @@ import { onErrorResumeNext } from 'rxjs/operators';
 
 import {
     AppsState,
-    ModalView,
+    DialogModel,
     ruleActions,
     RuleDto,
     RulesState,
@@ -27,7 +27,7 @@ export class RulesPageComponent implements OnInit {
     public ruleActions = ruleActions;
     public ruleTriggers = ruleTriggers;
 
-    public addRuleDialog = new ModalView();
+    public addRuleDialog = new DialogModel();
 
     public wizardMode = 'Wizard';
     public wizardRule: RuleDto | null;

src/Squidex/app/features/schemas/pages/schema/field.component.html

@@ -121,7 +121,7 @@
                 </button>
             </div>
                 
-            <ng-container *sqxModalView="addFieldDialog;onRoot:true;closeAuto:false">
+            <ng-container *sqxModalView="addFieldDialog;onRoot:true;closeAuto:false;closeAlways:true">
                 <sqx-field-wizard [schema]="schema" [parent]="field"
                     (completed)="addFieldDialog.hide()">
                 </sqx-field-wizard>

src/Squidex/app/features/schemas/pages/schema/field.component.ts

@@ -12,10 +12,11 @@ import { onErrorResumeNext } from 'rxjs/operators';
 import {
     AppPatternDto,
     createProperties,
+    DialogModel,
     EditFieldForm,
     fadeAnimation,
     ImmutableArray,
-    ModalView,
+    ModalModel,
     NestedFieldDto,
     RootFieldDto,
     SchemaDetailsDto,
@@ -44,14 +45,14 @@ export class FieldComponent implements OnInit {
     @Input()
     public patterns: ImmutableArray<AppPatternDto>;
 
-    public dropdown = new ModalView(false, true);
+    public dropdown = new ModalModel();
 
     public isEditing = false;
     public selectedTab = 0;
 
     public editForm: EditFieldForm;
 
-    public addFieldDialog = new ModalView();
+    public addFieldDialog = new DialogModel();
 
     constructor(
         private readonly formBuilder: FormBuilder,

src/Squidex/app/features/schemas/pages/schema/schema-page.component.ts

@@ -14,11 +14,12 @@ import { filter, map, onErrorResumeNext } from 'rxjs/operators';
 
 import {
     AppsState,
+    DialogModel,
     fadeAnimation,
     FieldDto,
     fieldTypes,
     MessageBus,
-    ModalView,
+    ModalModel,
     PatternsState,
     SchemaDetailsDto,
     SchemasState,
@@ -45,14 +46,14 @@ export class SchemaPageComponent implements OnDestroy, OnInit {
     public schemaExport: any;
     public schema: SchemaDetailsDto;
 
-    public exportSchemaDialog = new ModalView();
+    public exportSchemaDialog = new DialogModel();
 
-    public configureScriptsDialog = new ModalView();
+    public configureScriptsDialog = new DialogModel();
 
-    public editOptionsDropdown = new ModalView();
-    public editSchemaDialog = new ModalView();
+    public editOptionsDropdown = new ModalModel();
+    public editSchemaDialog = new DialogModel();
 
-    public addFieldDialog = new ModalView();
+    public addFieldDialog = new DialogModel();
 
     constructor(
         public readonly appsState: AppsState,

src/Squidex/app/features/schemas/pages/schema/types/string-validation.component.ts

@@ -14,7 +14,7 @@ import {
     AppPatternDto,
     FieldDto,
     ImmutableArray,
-    ModalView,
+    ModalModel,
     StringFieldPropertiesDto
 } from '@app/shared';
 
@@ -43,7 +43,7 @@ export class StringValidationComponent implements OnDestroy, OnInit {
     public showPatternSuggestions: Observable<boolean>;
 
     public patternName: string;
-    public patternsModal = new ModalView(false, false);
+    public patternsModal = new ModalModel();
 
     public ngOnDestroy() {
         this.patternSubscription.unsubscribe();

src/Squidex/app/features/schemas/pages/schemas/schemas-page.component.ts

@@ -14,8 +14,8 @@ import { map, onErrorResumeNext } from 'rxjs/operators';
 import {
     AppsState,
     CreateCategoryForm,
+    DialogModel,
     MessageBus,
-    ModalView,
     SchemaDto,
     SchemasState
 } from '@app/shared';
@@ -30,7 +30,7 @@ import { SchemaCloning } from './../messages';
 export class SchemasPageComponent implements OnDestroy, OnInit {
     private schemaCloningSubscription: Subscription;
 
-    public addSchemaDialog = new ModalView();
+    public addSchemaDialog = new DialogModel();
     public addCategoryForm = new CreateCategoryForm(this.formBuilder);
 
     public schemasFilter = new FormControl();

src/Squidex/app/features/settings/pages/clients/client.component.ts

@@ -15,8 +15,8 @@ import {
     AppClientsService,
     AppsState,
     ClientsState,
+    DialogModel,
     DialogService,
-    ModalView,
     RenameClientForm,
     UpdateAppClientDto
 } from '@app/shared';
@@ -37,7 +37,7 @@ export class ClientComponent implements OnChanges {
     public isRenaming = false;
 
     public token: AccessTokenDto;
-    public tokenDialog = new ModalView();
+    public tokenDialog = new DialogModel();
 
     public renameForm = new RenameClientForm(this.formBuilder);
 

src/Squidex/app/framework/angular/forms/dropdown.component.ts

@@ -13,7 +13,7 @@ const KEY_ESCAPE = 27;
 const KEY_UP = 38;
 const KEY_DOWN = 40;
 
-import { ModalView } from '@app/framework/internal';
+import { ModalModel } from '@app/framework/internal';
 
 export const SQX_DROPDOWN_CONTROL_VALUE_ACCESSOR: any = {
     provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => DropdownComponent), multi: true
@@ -35,7 +35,7 @@ export class DropdownComponent implements AfterContentInit, ControlValueAccessor
     @ContentChildren(TemplateRef)
     public templates: QueryList<any>;
 
-    public dropdown = new ModalView();
+    public dropdown = new ModalModel();
 
     public selectedItem: any;
     public selectedIndex = -1;

src/Squidex/app/framework/angular/modals/dialog-renderer.component.ts

@@ -9,10 +9,10 @@ import { Component, Input, OnDestroy, OnInit } from '@angular/core';
 import { Subscription } from 'rxjs';
 
 import {
+    DialogModel,
     DialogRequest,
     DialogService,
     fadeAnimation,
-    ModalView,
     Notification
 } from '@app/framework/internal';
 
@@ -29,7 +29,7 @@ export class DialogRendererComponent implements OnDestroy, OnInit {
     private dialogsSubscription: Subscription;
     private notificationsSubscription: Subscription;
 
-    public dialogView = new ModalView(false, true);
+    public dialogView = new DialogModel();
     public dialogRequest: DialogRequest | null = null;
 
     public notifications: Notification[] = [];

src/Squidex/app/framework/angular/modals/modal-view.directive.ts

@@ -8,7 +8,11 @@
 import { Directive, EmbeddedViewRef, Input, OnChanges, OnDestroy, Renderer2, SimpleChanges, TemplateRef, ViewContainerRef } from '@angular/core';
 import { Subscription } from 'rxjs';
 
-import { ModalView, Types } from '@app/framework/internal';
+import {
+    DialogModel,
+    ModalModel,
+    Types
+} from '@app/framework/internal';
 
 import { RootViewComponent } from './root-view.component';
 
@@ -21,7 +25,7 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
     private renderedView: EmbeddedViewRef<any> | null = null;
 
     @Input('sqxModalView')
-    public modalView: ModalView | any;
+    public modalView: DialogModel | ModalModel | any;
 
     @Input('sqxModalViewOnRoot')
     public placeOnRoot = false;
@@ -29,6 +33,9 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
     @Input('sqxModalViewCloseAuto')
     public closeAuto = true;
 
+    @Input('sqxModalViewCloseAlways')
+    public closeAlways = false;
+
     constructor(
         private readonly templateRef: TemplateRef<any>,
         private readonly renderer: Renderer2,
@@ -38,9 +45,10 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
     }
 
     public ngOnDestroy() {
-        this.stopListening();
+        this.unsubscribeToModal();
+        this.unsubscribeToClick();
 
-        if (Types.is(this.modalView, ModalView)) {
+        if (Types.is(this.modalView, DialogModel) || Types.is(this.modalView, ModalModel)) {
             this.modalView.hide();
         }
     }
@@ -50,12 +58,9 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
             return;
         }
 
-        if (this.subscription) {
-            this.subscription.unsubscribe();
-            this.subscription = null;
-        }
+        this.unsubscribeToModal();
 
-        if (Types.is(this.modalView, ModalView)) {
+        if (Types.is(this.modalView, DialogModel) || Types.is(this.modalView, ModalModel)) {
             this.subscription =
                 this.modalView.isOpen.subscribe(isOpen => {
                     this.update(isOpen);
@@ -71,11 +76,9 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
         }
 
         if (isOpen && !this.renderedView) {
-            if (this.placeOnRoot) {
-                this.renderedView = this.rootView.viewContainer.createEmbeddedView(this.templateRef);
-            } else {
-                this.renderedView = this.viewContainer.createEmbeddedView(this.templateRef);
-            }
+            const container = this.getContainer();
+
+            this.renderedView = container.createEmbeddedView(this.templateRef);
 
             if (this.renderedView.rootNodes[0].style) {
                 this.renderer.setStyle(this.renderedView.rootNodes[0], 'display', 'block');
@@ -85,18 +88,21 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
                 this.startListening();
             });
         } else if (!isOpen && this.renderedView) {
-            this.renderedView = null;
+            const container = this.getContainer();
+            const containerIndex = container.indexOf(this.renderedView);
 
-            if (this.placeOnRoot) {
-                this.rootView.viewContainer.clear();
-            } else {
-                this.viewContainer.clear();
-            }
+            container.remove(containerIndex);
 
-            this.stopListening();
+            this.renderedView = null;
+
+            this.unsubscribeToClick();
         }
     }
 
+    private getContainer() {
+        return this.placeOnRoot ? this.rootView.viewContainer : this.viewContainer;
+    }
+
     private startListening() {
         if (!this.closeAuto) {
             return;
@@ -112,7 +118,7 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
                     return;
                 }
 
-                if (this.modalView.closeAlways) {
+                if (this.closeAlways) {
                     this.modalView.hide();
                 } else {
                     try {
@@ -133,7 +139,14 @@ export class ModalViewDirective implements OnChanges, OnDestroy {
             });
     }
 
-    private stopListening() {
+    private unsubscribeToModal() {
+        if (this.subscription) {
+            this.subscription.unsubscribe();
+            this.subscription = null;
+        }
+    }
+
+    private unsubscribeToClick() {
         if (this.documentClickListener) {
             this.documentClickListener();
             this.documentClickListener = null;

src/Squidex/app/framework/angular/modals/onboarding-tooltip.component.ts

@@ -9,7 +9,7 @@ import { Component, Input, OnDestroy, OnInit, Renderer2 } from '@angular/core';
 
 import {
     fadeAnimation,
-    ModalView,
+    ModalModel,
     OnboardingService,
     Types
 } from '@app/framework/internal';
@@ -27,7 +27,7 @@ export class OnboardingTooltipComponent implements OnDestroy, OnInit {
     private closeTimer: any;
     private forMouseDownListener: Function | null;
 
-    public tooltipModal = new ModalView();
+    public tooltipModal = new ModalModel();
 
     @Input()
     public for: any;

src/Squidex/app/framework/angular/modals/tooltip.component.ts

@@ -7,7 +7,7 @@
 
 import { ChangeDetectionStrategy, Component, Input, OnDestroy, OnInit, Renderer2 } from '@angular/core';
 
-import { ModalView } from './../../utils/modal-view';
+import { ModalModel } from './../../utils/modal-view';
 
 import { fadeAnimation } from './../animations';
 
@@ -30,7 +30,7 @@ export class TooltipComponent implements OnDestroy, OnInit {
     @Input()
     public position = 'topLeft';
 
-    public modal = new ModalView(false, false);
+    public modal = new ModalModel();
 
     constructor(
         private readonly renderer: Renderer2

src/Squidex/app/framework/utils/modal-view.spec.ts

@@ -5,75 +5,115 @@
  * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
  */
 
-import { ModalView } from './modal-view';
+import { DialogModel, ModalModel, Openable } from './modal-view';
 
-describe('ModalView', () => {
+describe('DialogModel', () => {
     it('should have default values', () => {
-        const dialog = new ModalView();
+        const dialog = new DialogModel();
 
         checkValue(dialog, false);
+    });
+
+    it('should become open after show', () => {
+        const dialog = new DialogModel();
+
+        dialog.show();
 
-        expect(dialog.closeAlways).toBeFalsy();
+        checkValue(dialog, true);
     });
 
-    it('should have initial true value', () => {
-        const dialog = new ModalView(true);
+    it('should become open after toggle', () => {
+        const dialog = new DialogModel();
+
+        dialog.toggle();
 
         checkValue(dialog, true);
     });
 
-    it('should have initial false value', () => {
-        const dialog = new ModalView(false);
+    it('should become closed after hide', () => {
+        const dialog = new DialogModel().show();
+
+        dialog.hide();
 
         checkValue(dialog, false);
     });
 
-    it('should have close always set by constructor', () => {
-        const dialog = new ModalView(false, true);
+    it('should become closed after toggle', () => {
+        const dialog = new DialogModel().show();
+
+        dialog.toggle();
 
-        expect(dialog.closeAlways).toBeTruthy();
+        checkValue(dialog, false);
+    });
+
+    it('should not hide other dialog', () => {
+        const dialog1 = new DialogModel().show();
+        const dialog2 = new DialogModel();
+
+        dialog2.toggle();
+
+        checkValue(dialog1, true);
+        checkValue(dialog2, true);
+    });
+});
+
+describe('ModalModel', () => {
+    it('should have default values', () => {
+        const modal = new ModalModel();
+
+        checkValue(modal, false);
     });
 
     it('should become open after show', () => {
-        const dialog = new ModalView(false);
+        const modal = new ModalModel();
 
-        dialog.show();
+        modal.show();
 
-        checkValue(dialog, true);
+        checkValue(modal, true);
     });
 
     it('should become open after toggle', () => {
-        const dialog = new ModalView(false);
+        const modal = new ModalModel();
 
-        dialog.toggle();
+        modal.toggle();
 
-        checkValue(dialog, true);
+        checkValue(modal, true);
     });
 
     it('should become closed after hide', () => {
-        const dialog = new ModalView(true);
+        const modal = new ModalModel().show();
 
-        dialog.hide();
+        modal.hide();
 
-        checkValue(dialog, false);
+        checkValue(modal, false);
     });
 
     it('should become closed after toggle', () => {
-        const dialog = new ModalView(true);
+        const modal = new ModalModel().show();
 
-        dialog.toggle();
+        modal.toggle();
 
-        checkValue(dialog, false);
+        checkValue(modal, false);
     });
 
-    function checkValue(dialog: ModalView, expected: boolean) {
-        let result: boolean;
+    it('should hide other modal', () => {
+        const modal1 = new ModalModel().show();
+        const modal2 = new ModalModel();
 
-        dialog.isOpen.subscribe(value => {
-            result = value;
-        }).unsubscribe();
+        modal2.toggle();
 
-        expect(result!).toBe(expected);
-    }
+        checkValue(modal1, false);
+        checkValue(modal2, true);
+    });
 });
 
+function checkValue(modal: Openable, expected: boolean) {
+    let result: boolean;
+
+    modal.isOpen.subscribe(value => {
+        result = value;
+    }).unsubscribe();
+
+    expect(result!).toBe(expected);
+}
+

src/Squidex/app/framework/utils/modal-view.ts

@@ -7,49 +7,78 @@
 
 import { BehaviorSubject, Observable } from 'rxjs';
 
-export class ModalView {
-    private readonly isOpen$: BehaviorSubject<boolean>;
-    private static openView: ModalView | null = null;
+export interface Openable {
+    isOpen: Observable<boolean>;
+}
+
+export class DialogModel implements Openable {
+    private readonly isOpen$ = new BehaviorSubject<boolean>(false);
 
     public get isOpen(): Observable<boolean> {
         return this.isOpen$;
     }
 
-    constructor(isOpen = false,
-        public readonly closeAlways: boolean = false
-    ) {
-        this.isOpen$ = new BehaviorSubject(isOpen);
+    public show(): DialogModel {
+        this.isOpen$.next(true);
+
+        return this;
     }
 
-    public show() {
-        if (ModalView.openView !== this && ModalView.openView) {
-            ModalView.openView.hide();
-        }
+    public hide(): DialogModel {
+        this.isOpen$.next(false);
 
-        ModalView.openView = this;
+        return this;
+    }
 
-        this.isOpen$.next(true);
+    public toggle(): DialogModel {
+        this.isOpen$.next(!this.isOpen$.value);
+
+        return this;
     }
+}
+
+export class ModalModel implements Openable {
+    private readonly isOpen$ = new BehaviorSubject<boolean>(false);
 
-    public hide() {
-        if (ModalView.openView === this) {
-            ModalView.openView = null;
+    public get isOpen(): Observable<boolean> {
+        return this.isOpen$;
+    }
+
+    public show(): ModalModel {
+        if (!this.isOpen$.value) {
+            if (openModal && openModal !== this) {
+                openModal.hide();
+            }
+
+            openModal = this;
+
+            this.isOpen$.next(true);
         }
 
-        this.isOpen$.next(false);
+        return this;
     }
 
-    public toggle() {
-        let isOpenSnapshot = false;
+    public hide(): ModalModel {
+        if (this.isOpen$.value) {
+            if (openModal === this) {
+                openModal = null;
+            }
 
-        this.isOpen.subscribe(v => {
-            isOpenSnapshot = v;
-        }).unsubscribe();
+            this.isOpen$.next(false);
+        }
+
+        return this;
+    }
 
-        if (isOpenSnapshot) {
+    public toggle(): ModalModel {
+        if (this.isOpen$.value) {
             this.hide();
         } else {
             this.show();
         }
+
+        return this;
     }
-}
+}
+
+let openModal: ModalModel | null = null;

src/Squidex/app/shared/components/asset.component.ts

@@ -14,9 +14,9 @@ import {
     AssetsService,
     AuthService,
     DateTime,
+    DialogModel,
     DialogService,
     fadeAnimation,
-    ModalView,
     RenameAssetForm,
     Types,
     UpdateAssetDto,
@@ -68,7 +68,7 @@ export class AssetComponent implements OnInit {
     @Output()
     public failed = new EventEmitter();
 
-    public renameDialog = new ModalView();
+    public renameDialog = new DialogModel();
     public renameForm = new RenameAssetForm(this.formBuilder);
 
     public progress = 0;

src/Squidex/app/shared/components/language-selector.component.html

@@ -8,7 +8,7 @@
     <button type="button" class="btn btn-secondary dropdown-toggle" [attr.title]="selectedLanguage.englishName" (click)="dropdown.toggle(); $event.stopPropagation()" #button tabindex="-1">
         {{selectedLanguage.iso2Code}}
     </button>
-    <div class="dropdown-menu" *sqxModalView="dropdown" [sqxModalTarget]="button" @fade>
+    <div class="dropdown-menu" *sqxModalView="dropdown;closeAlways:true" [sqxModalTarget]="button" @fade>
         <div class="dropdown-item" *ngFor="let language of languages" [class.active]="language == selectedLanguage" (click)="selectLanguage(language)">
             <strong class="iso-code">{{language.iso2Code}}</strong> &nbsp; &nbsp; ({{language.englishName}})
         </div>

src/Squidex/app/shared/components/language-selector.component.ts

@@ -7,7 +7,7 @@
 
 import { Component, EventEmitter, Input, OnChanges, OnInit, Output } from '@angular/core';
 
-import { fadeAnimation, ModalView } from '@app/shared/internal';
+import { fadeAnimation, ModalModel } from '@app/shared/internal';
 
 export interface Language { iso2Code: string; englishName: string; isMasterLanguage: true; }
 
@@ -20,7 +20,7 @@ export interface Language { iso2Code: string; englishName: string; isMasterLangu
     ]
 })
 export class LanguageSelectorComponent implements OnChanges, OnInit {
-    public dropdown = new ModalView(false, true);
+    public dropdown = new ModalModel();
 
     @Input()
     public size: string;

src/Squidex/app/shared/components/markdown-editor.component.ts

@@ -10,7 +10,7 @@ import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
 
 import {
     AssetDto,
-    ModalView,
+    DialogModel,
     ResourceLoaderService,
     Types
 } from '@app/shared/internal';
@@ -34,7 +34,7 @@ export class MarkdownEditorComponent implements ControlValueAccessor, AfterViewI
     private value: string;
     private isDisabled = false;
 
-    public selectorModal = new ModalView();
+    public assetsDialog = new DialogModel();
 
     @ViewChild('editor')
     public editor: ElementRef;
@@ -79,7 +79,7 @@ export class MarkdownEditorComponent implements ControlValueAccessor, AfterViewI
     }
 
     private showSelector = () => {
-        this.selectorModal.show();
+        this.assetsDialog.show();
     }
 
     public ngAfterViewInit() {
@@ -206,6 +206,6 @@ export class MarkdownEditorComponent implements ControlValueAccessor, AfterViewI
             this.simplemde.codemirror.replaceSelection(content);
         }
 
-        this.selectorModal.hide();
+        this.assetsDialog.hide();
     }
 }

src/Squidex/app/shared/components/rich-editor.component.ts

@@ -10,7 +10,7 @@ import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
 
 import {
     AssetDto,
-    ModalView,
+    DialogModel,
     ResourceLoaderService,
     Types
 } from '@app/shared/internal';
@@ -35,7 +35,7 @@ export class RichEditorComponent implements ControlValueAccessor, AfterViewInit,
     private value: string;
     private isDisabled = false;
 
-    public selectorModal = new ModalView();
+    public assetsDialog = new DialogModel();
 
     @ViewChild('editor')
     public editor: ElementRef;
@@ -63,7 +63,7 @@ export class RichEditorComponent implements ControlValueAccessor, AfterViewInit,
     }
 
     private showSelector = () => {
-        this.selectorModal.show();
+        this.assetsDialog.show();
     }
 
     private getEditorOptions() {
@@ -147,6 +147,6 @@ export class RichEditorComponent implements ControlValueAccessor, AfterViewInit,
             this.tinyEditor.execCommand('mceInsertContent', false, content);
         }
 
-        this.selectorModal.hide();
+        this.assetsDialog.hide();
     }
 }

src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts

@@ -9,8 +9,6 @@ import { Router, RouterStateSnapshot } from '@angular/router';
 import { of } from 'rxjs';
 import { IMock, Mock, Times } from 'typemoq';
 
-import { MathHelper } from '@app/framework';
-
 import { SchemaDetailsDto } from './../services/schemas.service';
 import { SchemasState } from './../state/schemas.state';
 import { SchemaMustExistPublishedGuard } from './schema-must-exist-published.guard';
@@ -50,7 +48,7 @@ describe('SchemaMustExistPublishedGuard', () => {
 
     it('should load schema and return false when not found', () => {
         schemasState.setup(x => x.select('123'))
-        .returns(() => of(<SchemaDetailsDto>{ isPublished: false }));
+            .returns(() => of(<SchemaDetailsDto>{ isPublished: false }));
 
         let result: boolean;
 
@@ -80,7 +78,7 @@ describe('SchemaMustExistPublishedGuard', () => {
 
     it('should redirect to content when singleton', () => {
         schemasState.setup(x => x.select('123'))
-        .returns(() => of(<SchemaDetailsDto>{ isSingleton: true }));
+            .returns(() => of(<SchemaDetailsDto>{ isSingleton: true, id: 'schema-id' }));
 
         let result: boolean;
 
@@ -90,6 +88,6 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         expect(result!).toBeFalsy();
 
-        router.verify(x => x.navigate([state.url, MathHelper.EMPTY_GUID]), Times.once());
+        router.verify(x => x.navigate([state.url, 'schema-id']), Times.once());
     });
 });

src/Squidex/app/shared/guards/schema-must-exist-published.guard.ts

@@ -10,7 +10,7 @@ import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot } from
 import { Observable } from 'rxjs';
 import { map, tap } from 'rxjs/operators';
 
-import { allParams, MathHelper } from '@app/framework';
+import { allParams } from '@app/framework';
 
 import { SchemasState } from './../state/schemas.state';
 
@@ -32,8 +32,8 @@ export class SchemaMustExistPublishedGuard implements CanActivate {
                         this.router.navigate(['/404']);
                     }
 
-                    if (dto && dto.isSingleton && state.url.indexOf(MathHelper.EMPTY_GUID) < 0) {
-                        this.router.navigate([state.url, MathHelper.EMPTY_GUID]);
+                    if (dto && dto.isSingleton && state.url.indexOf(dto.id) < 0) {
+                        this.router.navigate([state.url, dto.id]);
                     }
                 }),
                 map(s => s !== null && s.isPublished));

src/Squidex/app/shell/pages/internal/apps-menu.component.html

@@ -11,7 +11,7 @@
         </span>
 
         <ng-container *ngIf="appsState.apps | async; let apps">
-            <div class="dropdown-menu" *sqxModalView="appsMenu" @fade>
+            <div class="dropdown-menu" *sqxModalView="appsMenu;closeAlways:true" @fade>
                 <a class="dropdown-item all-apps" routerLink="/app">
                     <span class="all-apps-text">All Apps</span> 
                     <span class="all-apps-pill badge badge-pill badge-primary">{{apps.length}}</span>

src/Squidex/app/shell/pages/internal/apps-menu.component.ts

@@ -9,8 +9,9 @@ import { Component } from '@angular/core';
 
 import {
     AppsState,
+    DialogModel,
     fadeAnimation,
-    ModalView
+    ModalModel
 } from '@app/shared';
 
 @Component({
@@ -22,9 +23,9 @@ import {
     ]
 })
 export class AppsMenuComponent {
-    public addAppDialog = new ModalView();
+    public addAppDialog = new DialogModel();
 
-    public appsMenu = new ModalView(false, true);
+    public appsMenu = new ModalModel();
 
     constructor(
         public readonly appsState: AppsState

src/Squidex/app/shell/pages/internal/profile-menu.component.html

@@ -8,7 +8,7 @@
             </span>
         </span>
 
-        <div class="dropdown-menu" *sqxModalView="modalMenu" @fade>
+        <div class="dropdown-menu" *sqxModalView="modalMenu;closeAlways:true" @fade>
             <a class="dropdown-item" routerLink="/app/administration" *ngIf="isAdmin">
                 Administration
             </a>

src/Squidex/app/shell/pages/internal/profile-menu.component.ts

@@ -13,7 +13,7 @@ import {
     ApiUrlConfig,
     AuthService,
     fadeAnimation,
-    ModalView
+    ModalModel
 } from '@app/shared';
 
 @Component({
@@ -27,7 +27,7 @@ import {
 export class ProfileMenuComponent implements OnDestroy, OnInit {
     private authenticationSubscription: Subscription;
 
-    public modalMenu = new ModalView(false, true);
+    public modalMenu = new ModalModel();
 
     public profileDisplayName = '';
     public profileId = '';

tests/Squidex.Domain.Apps.Entities.Tests/Contents/Guard/GuardContentTests.cs

@@ -43,11 +43,11 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         }
 
         [Fact]
-        public void CanCreate_should_not_throw_exception_if_singleton_and_id_empty()
+        public void CanCreate_should_not_throw_exception_if_singleton_and_id_is_schema_id()
         {
             A.CallTo(() => schema.IsSingleton).Returns(true);
 
-            var command = new CreateContent { Data = new NamedContentData(), ContentId = Guid.Empty };
+            var command = new CreateContent { Data = new NamedContentData(), ContentId = schema.Id };
 
             GuardContent.CanCreate(schema, command);
         }