Hi Patrick,
Thank you for using Syncfusion products.
Expand and collapse the parent node when it is disabledYou can expand and collapse the parent node which is disabled as follows.
[C#]
node = this.treeViewAdv1.Nodes[0];
if ( node.Enabled == false)
{
if(node.Expanded==false)
this.treeViewAdv1.Nodes[0].Expanded = !this.treeViewAdv1.Nodes[0].Expanded;
}
Please refer the below sample and let me know if this helps you.
http://websamples.syncfusion.com/samples/Tools.Windows/F74392_1/main.htmRegards,
Jaya