Hi Jay,
You could disable the checkbox or the option button of the respective node and still you can select and deselect the node by setting the EnabledButtons property to false of the respective treeNodeAdv as given below:
private void button1_Click(object sender, System.EventArgs e)
{
TreeNodeAdv node=this.treeViewAdv1.SelectedNode;
node.EnabledButtons=false;
}
Please take a look at the attached sample and let me know if this helps you.
Thanks for using Syncfusion Products.
Kind Regards,
Deepa.
DisableButtons.zip