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The tree component (SftTree/DLL by SoftelVDM) draws and operates properly on all Windows versions without WindowBlinds installed. It's only when WindowBlinds is running that there is a problem (and there are actually two problems -- sizing of the +/- button and improper drawing/responsiveness of scrollbars in some situations).
There may be something about the tree control that is less compatible with WindowBlinds than other tree controls, but I can certainly understand this tree vendor's position that they can't possibly support all third party Windows extensions such as WindowBlinds. The burden is on these third party vendors to make their environments fully compatible with plain vanilla (no third party extensions installed) Windows, so that applications that operate correctly there also operate correctly with the extensions installed.
I have no idea how WindowBlinds actually hooks into Windows to provide its functionality, but if they can provide specific technical info that demonstrates that the tree vendor is doing something improperly (incompatible/incorrect WRT plain vanilla Windows APIs), we would be happy to forward the info to the tree vendor in hopes that they will investigate further.
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