RichPanel improved

You can check my new expander (with a header and content controls) here

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I uploaded a new RichPanel with improvements.
– Design time Expanded property support.
– Prevent from disappearing while collapsing.
– Overriding events instead of writing an event handler inside control.
– Expanding mode now works also with DrawShadow=false (not necessarily set ShadowOffset=0).
– Using small (+) (-) icons which looks better.
– Changing default values for some properties which which looks better in my opinion.
– Added a HotIcon for the header (mouse hover)

Source

Thanks to Mohammad Elmi for thoses improvements.