Bug with Layer + Right Button click

[LingamYoni]

Steps to reproduce:

1. Open, compile and run graphics32\Examples\Layers\ImgView_Layers\ImgView_Layers.dpr
2. File->New...-> click Ok
3. Layers->New Bitmap Layer (or any)-> open
4. Right click on the layer. Now try to click on any menu item or close the program.

What is the expected behavior?
A tap on the button should fire the click event.

What is the current behavior?
The first tap highlights the button. The second tap fires the click event.

Thus, buttons need to be tapped twice in order to fire the click event!
There is no such problem with the left click on the layer.

Is there any way to fix this abnormal behavior?
My current workaround is

procedure TMainForm.ImgViewMouseUp(Sender: TObject; Button: TMouseButton;
    Shift: TShiftState; X, Y: Integer; Layer: TCustomLayer);
begin
  if Button = mbRight then ReleaseCapture;
end;