tooltip blocks mouseleave

[Martin Koob]

I have a bunch of line graphics on a stack 
that have a mouseenter and mouseleave handler 
which change the color of the graphic to indicate 
the mouse is over the graphic.  
Mouseenter changes it to blue mouseleave 
changes it to green.

This worked well until  I added tooltips to the graphics.  
Now, if I move the mouse quickly 

across a number of graphics it looks like the 
mouseleave does not always trigger some 
of the graphics remain blue.  It appears that 
the  displaying of the tooltip is interfering 
with  the mouseleave message.  Moving the 
mouse slowly across does not result in the 
behavior so it seems there is not time to 
process both the tooltip display and the 
mouseleave message when the mouse 
moves quickly across.

Any suggestions as to how to resolve this s
hort of removing the tooltips from 
the graphics?

Martin