I wanted to simply add a Getter only property to VisualLayerManager
It was called ChromeOverlayLayer and of type Panel... only a getter was declared and the value set in the getter if it didnt exist already.
I expected: <VisualLayerManager.ChromeOverlayLayer> <TitleBar /> to just add a titlebar to it..
it actually complains it cant find a setter to set ChromeOverlayLayer property to titlebar.