>>>
>>>I tested with MSComctlLib.TreeCtrl.2 and couldn't brake it.
>>
>>And I tested some more with the one we have and it breaks all over the place. Maybe it just needs to be reinstalled - who knows what's up. Weird indeed.
>
>Try to install from http://www.microsoft.com/downloads/details.aspx?FamilyID=25437d98-51d0-41c1-bb14-64662f5f62fe&DisplayLang=en

Still getting the same error.

I've created a new control based on this (copied all the PEMs), and it doesn't even fire a mouse down or mouse move event if it's not over the text. The difference may be in some API functions which are used to paint the background in the existing treeview class - they may have changed the behavior in some way.

I'm thinking of just giving up. This already took too much time and nerves.