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. The ImageSize property defines the size (width/height) of the icons within the control's Images collection. Use the ReplaceIcon method to add, remove or clear icons in the control's images collection. Use the CellImage, CellImages properties to assign icons to a cell. Use the CellPicture property to assign a picture to a cell. Use the CheckImage or RadioImage property to specify a different look for checkboxes or radio buttons in the cells.