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copied!<p>You can use the Selected event (Reference: <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.selected.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.selected.aspx</a>) on the TreeViewItem.</p> <p>When this event fires for Section1 or Section2, you can set the IsSelected property (Reference: <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.isselected.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.isselected.aspx</a>) on the TreeViewItem to false.</p> <p>You can also use the SelectedItemChanged event (Reference: <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.treeview.selecteditemchanged.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.controls.treeview.selecteditemchanged.aspx</a>) on the TreeView itself to unselect specific items when they are selected. </p> <p>Make sure you unsubscribe before you set the IsSelect property, otherwise the event may fire multiple times. And don't forget to re-subscribe to the event after you set the IsSelect property.</p> <p>Edit: Or even better, use the Collapsed event (Reference: <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.collapsed.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.controls.treeviewitem.collapsed.aspx</a>) that is on the TreeViewItem.</p>

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