Hi Raul,
Thank you for your interest in Syncfusion Products.
Yes it is possible to add button or any other control to the TreeviewNode using Custom Control option. But it is not possible to have more than one button for each node:
// Parent Node
this.treeViewAdv1.Nodes[3].CustomControl = this.button4;
// Child Node
this.treeViewAdv1.Nodes[4].Nodes[0].CustomControl = this.button5;
Please find the simple sample in the following link:
http://websamples.syncfusion.com/samples/Tools.Windows/F72622/main.htmPlease let me know if any concerns.
Regards,
Fathima