WPF Merge ContextMenues in XAML - wpf

Question

is it possible to merge two ContextMenues in XAML?
I created two ContextMenues as resources. I use them in a couple of DataTemplates and it works fine. However, for some DataTemplates, I would like to merge the two ContextMenues. Unfortunately, this does not seem to work.
Here's a bit of the code from one of these ContextMenues, the other ones are defined the same:
<ContextMenu x:Key="CtxIEditableViewModel" DataContext="{Binding PlacementTarget,RelativeSource={RelativeSource Self}}">
<MenuItem Header="Edit" Command="{Binding Path=DataContext.EditCommand}" CommandParameter="{Binding }">
<MenuItem.Icon>
<Image Source="{StaticResource IcoEdit}" Width="16" Height="16"></Image>
</MenuItem.Icon>
</MenuItem>
...
Using one of those ContextMenues works fine:
<StackPanel Orientation="Horizontal" ContextMenu="{StaticResource CtxIEditableViewModel}">
But how to merge two? This does not work
<StackPanel Orientation="Horizontal">
<ContextMenu>
<ContextMenu.ItemsSource>
<CompositeCollection>
<StaticResource ResourceKey="CtxIEditableViewModel" />
<StaticResource ResourceKey="CtxRootViewModel" />
</CompositeCollection>
</ContextMenu.ItemsSource>
And this does not work either:
<StackPanel Orientation="Horizontal">
<ContextMenu>
<StaticResource ResourceKey="CtxIEditableViewModel" />
<StaticResource ResourceKey="CtxRootViewModel" />
</ContextMenu>
When I run the programm an exception is thrown saying that the context menu may not contain a logical or visual parent. Since it works fine if I only use one ContextMenu, I do not understand the exception message.
How can I merge those two ContextMenues in XAML (or is it not possible at all)?

Answer 1

here one way to do it using CompositeCollection
<Window.Resources>
<x:Array Type="{x:Type sys:Object}" x:Key="CtxIEditableViewModel">
<MenuItem Header="Edit1"/>
<MenuItem Header="Edit2"/>
</x:Array>
<x:Array Type="{x:Type sys:Object}" x:Key="CtxRootViewModel">
<MenuItem Header="Root1" />
<MenuItem Header="Root2"/>
</x:Array>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Grid.Row="0" Background="LightBlue">
<Border.ContextMenu>
<ContextMenu>
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource CtxIEditableViewModel}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
</Border.ContextMenu>
</Border>
<Border Grid.Row="1" Background="LightGreen">
<Border.ContextMenu>
<ContextMenu>
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource CtxRootViewModel}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
</Border.ContextMenu>
</Border>
<Border Grid.Row="2" Background="Khaki">
<Border.ContextMenu>
<ContextMenu>
<ContextMenu.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{StaticResource CtxIEditableViewModel}" />
<CollectionContainer Collection="{StaticResource CtxRootViewModel}" />
</CompositeCollection>
</ContextMenu.ItemsSource>
</ContextMenu>
</Border.ContextMenu>
</Border>
</Grid>