API GetMouseButtonClicked

Returns the mouse button responsible during an OnClick event (e.g. "RightButton").
 buttonName = GetMouseButtonClicked()
==Returns==
:;buttonName: - name of the button responsible for the innermost OnClick event. For example, "LeftButton"
==Details==
* The buttonName return value may be an arbitrary string (as the method accepts arbitrary arguments).
* If there are multiple OnClick handler dispatches on the call stack, information about the innermost one is returned.