OnClientToggleListToggling
The OnClientToggleListToggling client-side event occurs after a toggle button inside of ToggleList is clicked, before the ribbonbar responds to the mouse click.
The instance of the ribbonbar firing the event.
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An eventArgs parameter containing the following methods:
get_button() returns a reference of the toggle button which is clicked.
set_cancel() lets you cancel the event and prevent the default action.
get_domEvent() returns the DOM event object.