By default, the Image property is -1, which indicates no icon associated. The Image is displayed on the left side of the item's caption. The Images method should be used to specify a collection of icons to be used by the control. Use the ReplaceIcon method to add, remove or clear icons in the control's images collection. The <img> tag can be used in the Caption property of the Item object to display an Icon or a custom-size picture. Use the HTMLImage property to assign a BMP, JPG, GIF or PNG file to left side of the caption, the same way as you will do with the Image property.