Occurs when an end-user clicks this WindowsUIButton.
The Click event's data class is EventArgs.
Handle the Click event to respond to an end-user clicking this WindowsUIButton. This event occurs only for buttons whose Style property is ButtonStyle.PushButton. Check buttons do not raise the Click event.
The Click event is raised by individual buttons and thus completes the WindowsUIButtonPanel.ButtonClick and BaseContentContainer.ButtonClick events, which in their turn occur for the entire button container.