...select a TreeView node with the right mouse button?

procedure TForm1.TreeView1ContextPopup(Sender: TObject; MousePos: TPoint;
  var Handled: Boolean);
var
  tmpNode: TTreeNode;
begin
  tmpNode := (Sender as TTreeView).GetNodeAt(MousePos.X, MousePos.Y);
  if tmpNode <> nil then
    TTreeView(Sender).Selected := tmpNode;
end;

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