Rename GroupBoxHelper to HeaderedControlHelper and introduced a new AttachedProperty HeaderBackground #3636
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Describe the changes you have made to improve this project
GroupBoxHelper
was renamed toHeaderedControlHelper
as it applies to allHeaderControls
.AttachedProperty
to set the Background of the header part:HeaderedControlHelper.HeaderBackground
. That way one can define a Background of the Content and of the Header seperatly./!\ This is a Breaking Change
Unit test
None
Additional context

Here is a result how it might look (The default style did not change)
Closed Issues
Closes #3634
Closes #3633