Hi Jordan.

this.imagelist = this.parent.olecontrol2

This should work just fine. Let me guess: this code is in the Init() of the TreeView and you are getting an error.

If this is the case, it is because the TreeView is getting instantiated before the ImageList. Just move the code to form's Init() (and change it appropriately). In the form's init, you can be sure that both controls have been instantiated.