Thank you for the question.
In order to set an image to a RadTreeNode at runtime, just assign an image object to the RadTreeNode.Image property. I am demonstrating this behavior in the attached sample project. As you will notice, I am using the FindByTextCommand
which allows me to easily find a node and set its properties.
I am not sure that I understand the requirement from your last sentence. Could you please provide me with additional details about it?
the Telerik team