Raised when the user quickly clicks twice on the control.
This event is raised everywhere in the control, even on internal scrollbars, buttons...
This is a low event, as MouseDown and MouseUp, and you usually do not need to use it.
Instead you will use a higher level event like Activate.
For example, if you want to know if the user double-clicked on an item of a ListView,
then you must use the Activate event.