How to scroll through the WinForms TreeViewAdv control using up or down arrow keys while in edit mode?

private void treeViewAdv1_BeforeEdit(object sender, Syncfusion.Windows.Forms.Tools.TreeNodeAdvBeforeEditEventArgs e)
{
   TempNode=e.Node;
   TextBox t=e.TextBox;
   //To handle the Keys while editing the node
   t.KeyDown+=new KeyEventHandler(t_KeyDown);
}
private void t_KeyDown(object sender, KeyEventArgs e)
{
   TextBox t=sender as TextBox;
   if(e.KeyData==Keys.Down||e.KeyData==Keys.Up)
   {
       //To Stop the editing
       this.treeViewAdv1.EndEdit(true);
       //To replace the edited contents into the selected node.
       TempNode.Text=t.Text;
       //End the event
       e.Handled=true;
   }
}

Private Sub treeViewAdv1_BeforeEdit(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.TreeNodeAdvBeforeEditEventArgs)
   TempNode=e.Node
   Dim t As TextBox=e.TextBox
   'To handle the Keys while editing the node
   AddHandler t.KeyDown, AddressOf t_KeyDown
End Sub
Private Sub t_KeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
   Dim t As TextBox=CType(IIf(TypeOf sender Is TextBox, sender, Nothing), TextBox)
   If e.KeyData=Keys.Down OrElse e.KeyData=Keys.Up Then
      'To Stop the editing
      Me.treeViewAdv1.EndEdit(True)
      'To replace the edited contents into the selected node.
      TempNode.Text=t.Text
      'End the event
      e.Handled=True
   End If
End Sub