I just used the SplitButton option for the first time, and I'm a bit underwhelmed. It works, yes, but having to add custom Javascript to control the interaction between a button and a separate context menu isn't very integrated. The RadButton should have an option for a 'SplitMenuID' field, which would automatically associate the controls and generate the needed Javascript to make the menu drop down when the downward arrow is clicked, the same way a RadTabStrip and RadMultiPage can be associated with each other without needing to write separate Javascript.