Use case: when RadPopupEditor is opened, the focus is sent to the popup control which handles all the pressed keys. It would be added public API which provides the possibility to plug into this keyboard handling and customize the behavior.
For example, when the popup is opened, pressing Escape, closes the popup. This functionality comes from the RadPopupContainerForm.OnKeyDown which behavior can't be overridden.
Currently, only the listener can be removed for a certain popup:Private Sub RadPopupEditor_PopupOpened(sender As Object, e As EventArgs) PopupManager.Default.RemovePopup(Me.RadPopupEditor1.PopupEditorElement.PopupContainerForm)
UPDATE: The API should allow handling the mouse input as well and the developer should control whether the message will be managed further.