Using IsTextSearchEnabled property of tree view controls you can get highlight items whose first letter is equal to the key your have pressed
IsTextSearchEnabled
<TreeView>
<TreeViewItem Header="Employee1">
<TreeViewItem Header="Jesper"/>
<TreeViewItem Header="Aaberg"/>
<TreeViewItem Header="12345"/>
</TreeViewItem>
<TreeViewItem Header="Employee2">
<TreeViewItem Header="Dominik"/>
<TreeViewItem Header="Paiha"/>
<TreeViewItem Header="98765"/>
</TreeViewItem>
</TreeView> |
Use above code to create tree view control with answers and press Key 'E", you will see the treeview will highlight two time on Employee1 and Employee2
More details go to the following link