OnClientSplitButtonClicking
The OnClientSplitButtonClicking client-side event occurs when the user clicks on a ribbonbar split button, before the ribbonbar responds to the mouse click.
The event handler receives two parameters:
The instance of the ribbonbar firing the event.
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An eventArgs parameter containing the following methods:
get_button() returns a reference to the ribbonbar split button that was clicked. In this case it is RibbonBarSplitButton.
set_cancel() lets you prevent the ribbonbar from responding to the mouse click.