How to change treegrid icons depending on value?

How can I dinamically change the (leaf.gif) icon depending on which action i trigger. I have three buttons that add rows but I want that each button shows a different icon. Now it only shows leaf.gif. How can I make this?

Thanks in advance.

You may try to use setItemImage() method to change the image for a cell at any time:

http://docs.dhtmlx.com/doku.php?id=dhtmlxtreegrid:api_method_dhtmlxgridobject_setitemimage