fix call to virtual method from ctor.

native/Avalonia.Native/src/OSX/PopupImpl.mm

@@ -26,17 +26,13 @@ private:
     PopupImpl(IAvnWindowEvents* events, IAvnGlContext* gl) : WindowBaseImpl(events, gl)
     {
         WindowEvents = events;
+        [Window setLevel:NSPopUpMenuWindowLevel];
     }
 protected:
     virtual NSWindowStyleMask GetStyle() override
     {
         return NSWindowStyleMaskBorderless;
     }
-    
-    virtual void OnInitialiseNSWindow () override
-    {
-        [Window setLevel:NSPopUpMenuWindowLevel];
-    }
 
 public:
     virtual bool ShouldTakeFocusOnShow() override

native/Avalonia.Native/src/OSX/WindowBaseImpl.h

@@ -106,8 +106,6 @@ protected:
     virtual NSWindowStyleMask GetStyle();
 
     void UpdateStyle();
-                           
-    virtual void OnInitialiseNSWindow ();
 
 private:
     void CreateNSWindow (bool isDialog);

native/Avalonia.Native/src/OSX/WindowBaseImpl.mm

@@ -567,11 +567,6 @@ void WindowBaseImpl::CreateNSWindow(bool isDialog) {
     }
 }
 
-void WindowBaseImpl::OnInitialiseNSWindow()
-{
-    
-}
-
 void WindowBaseImpl::InitialiseNSWindow() {
     if(Window != nullptr) {
         [Window setContentView:StandardContainer];
@@ -594,8 +589,6 @@ void WindowBaseImpl::InitialiseNSWindow() {
                 [GetWindowProtocol() showWindowMenuWithAppMenu];
             }
         }
-        
-        OnInitialiseNSWindow();
     }
 }
 

native/Avalonia.Native/src/OSX/WindowImpl.h

@@ -93,8 +93,6 @@ BEGIN_INTERFACE_MAP()
 
     virtual bool IsDialog() override;
     
-    virtual void OnInitialiseNSWindow() override;
-    
     virtual void BringToFront () override;
     
     bool CanBecomeKeyWindow ();
@@ -103,6 +101,7 @@ protected:
     virtual NSWindowStyleMask GetStyle() override;
 
 private:
+    void OnInitialiseNSWindow();
     NSString *_lastTitle;
 };
 

native/Avalonia.Native/src/OSX/WindowImpl.mm

@@ -24,6 +24,8 @@ WindowImpl::WindowImpl(IAvnWindowEvents *events, IAvnGlContext *gl) : WindowBase
     _lastTitle = @"";
     _parent = nullptr;
     WindowEvents = events;
+    
+    OnInitialiseNSWindow();
 }
 
 void WindowImpl::HideOrShowTrafficLights() {
@@ -41,6 +43,7 @@ void WindowImpl::HideOrShowTrafficLights() {
 
 void WindowImpl::OnInitialiseNSWindow(){
     [GetWindowProtocol() setCanBecomeKeyWindow:true];
+    
     [Window disableCursorRects];
     [Window setTabbingMode:NSWindowTabbingModeDisallowed];
     [Window setCollectionBehavior:NSWindowCollectionBehaviorFullScreenPrimary];