UIHANDLER OnDoubleClick

Description
The OnDoubleClick handler is called when a UI element is double-clicked with the mouse.

Arguments
self - the button frame being clicked

button - a string representing the button that was clicked. Can be any of the following: According to how the UI element is setup with API_Button_RegisterForClicks
 * LeftButton
 * RightButton
 * MiddleButton
 * Button4
 * Button5