Hello Juan Pablo,
Thank you for the question.
There are two approaches that I would suggest:
- Making an image appropriate for your needs. The background color of this image will be the back color of RadTreeView, its size will be equal to the size of RadTreeView and the desired 'bottom-left' image should be placed in the bottom left part of the this RadTreeView-sized image.
- Add an ImagePrimitive to RadTreeView and assign it your 'bottom-left' image. Please note that, if you want to follow this approach, you should turn off the RadTreeNodes' animations. To do so, make your custom theme, where the Animate checkboxes of the TreeNodeUI's state tabs are unchecked. In addition, in your project, you should call RadTreeView.Invalidate() whenever you move the form and RadTreeView.InvalidateNode when the mouse pointer is leaving a node.
I have demonstrated both approaches in the sample project attached. I hope this helps. If you have additional questions, feel free to contact me.
the Telerik team
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