delphi 如何知道 Treeview,Listview 当前最上面显示的节点

如何知道 Treeview,的节点是根节点

 

 

 

procedure TForm1.TreeView1ContextPopup(Sender: TObject; MousePos: TPoint;
  var Handled: Boolean);
begin
    if TreeView1.Selected.IsFirstNode then
       mni_delete.Enabled:=false
    else
    mni_delete.Enabled:=True;
 
end;

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