WPF DataBound treeview expand / collapse

Question

I\'m just trying to find a way to control the expand / collapse of the TreeView nodes through the object they\'re bound to. The object has an IsExpanded

Answer 1

Came up with solution. Really simple:

So the style gets the object bound to the TreeViewItem and looks at its IsNodeExpanded attribute and it assigns that value to the TreeViewItem.IsExpanded property. If you add Mode=TwoWay, they'll notify each other (TreeViewItem will tell the object when it has been expanded).

Thanks!