Hi Krunoslav,
The fix for the "TreeViewAdv does not refresh when we call Collapse/Expand method" has been included in our Final release of v.4.2(v.4.2.0.37) .
And you can download the same from the following link:
4.2VFinalRelease
Let me know if you need any further assistance. Thanks for your interest in Essential Tools.
Regards,
Deepa