SplitButton should have HotKey property like Button and DropDownButton

[ionite34]

Is your feature request related to a problem? Please describe.

Currently SplitButton is the only Button that does not support the HotKey property, and setting the HotKeyManager.HotKey attached property does not work when the view is loaded and unloaded (Button handles this by resetting the property in Button.OnAttachedToLogicalTree)

Describe the solution you'd like

Copy over the HotKeyProperty and OnAttachedToLogicalTree handling from Button to SplitButton, linking the HotKey to the main SplitButton.Command

[timunie]

Sounds like an oversight to me. A PR is welcome. Use AddOwner when adding the StyledProperty

[robloo]

Yea, I missed this with the initial implementation. I'll check WinUI as well but this shouldn't be an issue to add. I'll add it to the list.