AnyBody know how to "kill" a dataWindow toolTip once it has been opened?

I have a dataWindow that I have set up with toolTips and everything works as I would expect.  If I hover, the toolTip pops and I see the expected results.  My problem is that under certain circumstances I would like to manually close the toolTip even if the user does not move the mouse.  When I run SpyXX and I do see a lot of tooltips_class32 objects in the list, but does anyone know the API calls to locate the displayed toolTip and send a close message to it?

Thanks for reading.