As the title describes, I have a user control with a RadDocking element, then a RadDocking.DocumentHost.
Any element inside the DocumentHost is not selectable in the designer, also the outline view only shows elements until the RadDocking element not the DocumentHost inside it.
If I don't use the DocumentHost and place RadSplitContainer directly in the RadDocking selecting and outline is working as expected.
I use the last version I have access to: Version 2018.1.430