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Frequently Asked Questions

Closing popup menu in system tray application

Question:

Sometimes, my popup menu in my tray application does not close when it loses focus. How can I get it to close?

Answer:

When processing the message to pop up the menu, you need to set the
foreground window, then send a WM_NULL message after the menu popup.

procedure TForm1.WndProc(var Msg : TMessage);
var
  p : TPoint;
begin
  case Msg.Msg of
    WM_USER + 1:
    case Msg.lParam of
      WM_RBUTTONDOWN: begin
         SetForegroundWindow(Handle);
         GetCursorPos(p);
         PopupMenu1.Popup(p.x, p.y);
         PostMessage(Handle, WM_NULL, 0, 0);
      end;
    end;
  end;
  inherited;
end;

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