Updated LayoutContent (markdown)

LayoutContent.md

@@ -3,6 +3,28 @@ Derives from Xceed.Wpf.AvalonDock.Layout.LayoutElement
 
 Base class of the [[LayoutAnchorable]] and [[LayoutDocument]] classes.
 
+### Property IsActive
+
+Gets or sets whether the content is active.
+
+Only one LayoutContent can be active in a DockingManager. When setting this property, make sure this LayoutContent is already added to its parent or the parent won't be able to set its other children IsActive property to false.
+For example, the DockingManager contains 2 LayoutAnchorablePanes and each of them contains 2 LayoutAnchorables. Only 1 of the 4 LayoutAnchorable will have its IsActive property true ; the last one that was clicked, or got focus.
+
+In the following image, LayoutAchorables "333" was just clicked and will have its IsActive property true.
+
+[[LayoutContent_IsActive.png]]
+
+### Property IsSelected
+
+Gets or sets whether a content element is selected.
+
+Many LayoutContents could be selected in a DockingManager.
+For example, the DockingManager contains 2 LayoutAnchorablePanes and each of them contains 2 LayoutAnchorables. Each of the LayoutAnchorablePanes will have one of its chidren selected. So there will be 2 LayoutAnchorables having their IsSelected property true; the selected ones in each of the LayoutAnchorablePane.
+
+In the following image, LayoutAcnhorables "111" and "444" will have their IsSelected property true.
+
+[[LayoutContent_IsSelected.png]]
+
 ### Properties
 | Property | Description |
 | --- | --- |
@@ -15,7 +37,7 @@ Base class of the [[LayoutAnchorable]] and [[LayoutDocument]] classes.
 | FloatingTop | Gets or sets the top edge of a floating window that will contain this content. |
 | FloatingWidth | Gets or sets the width that will be initially used when the content is dragged and then displayed in a floating window. |
 | IconSource | Gets the icon source of the content (displayed next on the tab). |
-| IsActive | Gets whether the content is active. |
+| IsActive | Gets or sets whether the content is active. |
 | IsEnabled | Gets or sets if the LayoutDocument or LayoutAnchorable is Enabled. Default is True. |
 | IsFloating | Gets or sets whether the content is in a floating window. |
 | IsLastFocusedDocument | Gets whether the content is the last focused document. |