You could create the imagelist as a seperate class. In the init of the form assign a new instance of the imagelist subclass to a form property.

THIS.ImageList = NEWOBJECT('MyImages','ImageListLib')

Then you can assign it to the tree.
THIS.TreeView.ImageList = THIS.ImageList.Object

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Dan,
Yep, you are right - this is one of the workarounds of the ugly containter-with-ActiveX class subclassing issues.

Kind Regards