下面的示例展示了当内置编辑器被激活和关闭时，如何改变获得焦点的节点的状态图像。 为了对激活和关闭内置编辑器作出响应，接管了 TreeList.ShownEditor 和 TreeList.HiddenEditor 事件。 TreeList.CellValueChanged 事件被接管，从而改变节点的选中图像，以便于指明节点单元格的取值被最终用户修改。

下面的插图展示了运行结果。

C#CopyCode image复制代码
using DevExpress.XtraTreeList;

private void treeList1_ShownEditor(object sender, System.EventArgs e) {
   TreeList tlist = sender as TreeList;
   tlist.FocusedNode.StateImageIndex = 0;
}

private void treeList1_HiddenEditor(object sender, System.EventArgs e) {
   TreeList tlist = sender as TreeList;
   tlist.FocusedNode.StateImageIndex = -1;
}

private void treeList1_CellValueChanged(object sender, 
DevExpress.XtraTreeList.CellValueChangedEventArgs e) {
   e.Node.SelectImageIndex = 1;
   e.Node.ImageIndex = 1;
}
Visual BasicCopyCode image复制代码
Imports DevExpress.XtraTreeList

Private Sub TreeList1_ShownEditor(ByVal sender As Object, 
ByVal e As System.EventArgs) Handles TreeList1.ShownEditor
   Dim tlist As TreeList = CType(sender, TreeList)
   tlist.FocusedNode.StateImageIndex = 0
End Sub

Private Sub TreeList1_HiddenEditor(ByVal sender As Object, 
ByVal e As System.EventArgs) Handles TreeList1.HiddenEditor
   Dim tlist As TreeList = CType(sender, TreeList)
   tlist.FocusedNode.StateImageIndex = -1
End Sub

Private Sub TreeList1_CellValueChanged(ByVal sender As Object, 
ByVal e As DevExpress.XtraTreeList.CellValueChangedEventArgs) 
Handles TreeList1.CellValueChanged
   e.Node.SelectImageIndex = 1
   e.Node.ImageIndex = 1
End Sub