Is it possible to have nested regions in a Composite WPF application? I want modules to be able to inject new menus, and also be able to inject menu items into an existing menu.
Using the following code the RegionManager
throws an exception saying "The region manager does not contain the MainFileMenuRegion
region":
<Menu cal:RegionManager.RegionName="MainMenuRegion">
<MenuItem cal:RegionManager.RegionName="MainFileMenuRegion" Header="_File" />
</Menu>