Fix SplitButton contents disappearing on subsequent clicks #3675
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Derive SplitButton from ComboBox to fix disappearing Items. Implementing only the interesting stuff from the ComboBox is not possible because of too many internal things. - Derive from ComboBox - `IsExpanded` DP is now `IsDropDownOpen` - Remove `ListBoxStyle` DP - The `SplitButton` template uses now an ItemsPresenter like the ComboBox instead a full ListBox - The `IsEditable` property will be ignored and is always set to false
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Describe the changes you have made to improve this project
Derive
SplitButtonfrom ComboBox to fix disappearing Items. Implementing only the interesting stuff from the ComboBox is not possible because of too many internal things.IsExpandedDP is nowIsDropDownOpenListBoxStyleDPSplitButtontemplate uses now an ItemsPresenter like the ComboBox instead a full ListBoxIsEditableproperty will be ignored and is always set to falseClosed Issues
Closes #3513