By default, the ShowImageList property is True. Use the ShowImageList property to hide the control's images list window. The control's images list window is visible only at design time. Use the Images method to associate an images list control to the tree control. Use the ReplaceIcon method to add, remove or clear icons in the control's images collection. Use the Image property to assign an icon to a node. Use the Picture property to load a picture to a node.