procedure TMyForm.TreeChange(Sender: TObject; Node: TTreeNode);
 var
   i : integer;
   pp, cp : TTreeNode;
 begin
   if Assigned(Tree.Selected) then
     begin
       cp := Tree.Selected;
       pp := cp;
       for i := 1 to Round(Tree.Height/30) do
         if cp <> nil then
           begin
             pp := cp;
             cp := cp.GetPrevVisible;
           end;
       Tree.TopItem := pp;
     end;
 end;