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ScrollCanvas is a first step of project (MaxiList), with him you can add more scrollbar in your canvas

IMPORTANT: Please checked Activer la gestion des Threads in the PureBasic compiler option

The module and the testing code is here

https://github.com/microdevweb/ScrollCanvas

Your scroll bar looks very good.
But I found a bug: http://workupload.com/file/mRCmfzV
Procedure: DrawButtonH()
Line: Box(X,Y,W,H)
Error: StopDrawing() must be called before calling StartDrawing() again.
PB version: 5.41 LTS x64