def mouse_down_right_at(self,locator,coordString):
self.do_command("<STR_LIT>", [locator,coordString,])<EOL>
Simulates a user pressing the right mouse button (without releasing it yet) at
the specified location.

'locator' is an element locator
'coordString' is specifies the x,y position (i.e. - 10,20) of the mouse      event relative to the element returned by the locator.