What steps will reproduce the problem?
1. Configure Fubar_PerformanceFu to show a large number of addons - enough that the list does not fit on the screen.
2. Note that the tooltip now shows a scrollbar.
3. Attempt to move the mouse into the tooltip window to scroll it.

What is the expected output? What do you see instead?
I expect to be able to scroll the data, since there is a scrollbar present.  What happens is that the tooltip disappears as soon as my mouse comes off the Fubar_PerformanceFu entry in the Fubar panel.

What version of the product are you using?
FuBar_PerformanceFu v2.0.0b

Do you have an error log of what happened?
No errors occur - the tooltip simply closes as normal.