title: How do I create tri-state checkboxes with a TreeView control in .NET?
body: <p>I have a treeview control in a Windows Forms project that has checkboxes turned on. Because the treeview control has nested nodes, I need the checkboxes to be able to have some sort of tri-mode selection. I can't find a way to do this (I can only have the checkboxes fully checked or unchecked).</p>