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Editorial Team
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Asked: 2026-05-28T17:01:55+00:00

I’m making a custom control that’s an expandable/collapsable panel, which I can then fill

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I’m making a custom control that’s an expandable/collapsable panel, which I can then fill with other controls. I’m unsure of how to hook the expand/collapse command up to the button.

I’ve used this to get the panel to listen:

    CommandManager.RegisterClassInputBinding(GetType(Button), New InputBinding(ToggleBtnCommand, New MouseGesture(MouseAction.LeftClick)))
    CommandManager.RegisterClassCommandBinding(GetType(Button), New CommandBinding(ToggleBtnCommand, AddressOf btnToggleState))

This works, as long as I only use one panel per window. If I use more panels, all are expanded or collapsed when the button is pushed. How can I make the control understand that only the one containing the pushed button (the “command trigger”) should listen to the command?

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1 Answer

  1. Editorial Team

    In your ToggleBtnCommand (it’s really by the by but I’d personally remove Btn from the name as commands are UI agnostic) – execution handler you’d have ExecutedRoutedEventArgs as a secong argument, by comparing its Source & OriginalSource you can say whether it’s a ‘local’ command or not.

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