Hi Team,

Currently, if you try to use a CornerRadius property with the RadExpanderHeader control, the radius is not clipped and you end up with something like this when applying a shadow.

this feature request is to allow any corner radius to be applied all the way through the base.

When tapping on the header, the content does not expand. You can see the arrow is rotated, still content is missing. 

RadExpander controls is rendering too slow in mac debug mode 

When changing the view, it takes a lot of time to render the interface after the constructor is executed

Users should be able to control the Expander using the keyboard on Desktop.