Event disappears on button Style designer

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I would like to create a personalized style on expander in firemonkey. But when I want to add an event on a button (I replace the checkbox by a button that I have drag and drop from palette), then when I save, the event disappear and is not triggered.

What am I doing wrong ?

Thanks in advance.

EDIT : enter image description here

When I create/select an event from the dropdownmenu, when I saved the style, the selected event diseaper from the onclick event but my code is always written

EDIT 2 :

I have an Expander, and I would like to replace the default Checkbox by a Button.

So, I Edit the Default Style and replace the default Checkbox by a SpeedButton (like in the picture above)

At this Button, I want to add an Event on the OnClick. So I double click on the empty space beside the OnClick event and write the code into this event created automatically.

Once my code written, I'm go back in the Style Designer and I see the Event attached to the OnClick button, then I save the style.

But when I return to the Style Designer, the Event is not attached anymore to the Onclick event but he's still write/exist in code.

I tell myself I made a wrong saved, but the button him is still here, so I for me It's really saved.

I hope I'm clear. enter image description here

LAST EDIT :

    object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 480
  ClientWidth = 640
  StyleBook = StyleBook1
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object Expander1: TExpander
    Align = Client
    ShowCheck = False
    Size.Width = 640.000000000000000000
    Size.Height = 480.000000000000000000
    Size.PlatformDefault = False
    StyleLookup = 'Expander1Style1'
    Text = 'Expander1'
    TabOrder = 0
    ContentSize = '455'
  end
  object StyleBook1: TStyleBook
    Styles = <
      item
      end
      item
        Platform = 'Windows 10 Desktop'
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      end>
  end
end
1

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Bruce On

You can't set an event in Style Designer. You should call FindStyleResource in the OnApplyStyleLookup event passing the StyleName of the object and return it as a TFMXObject, like this:

procedure TForm1.Expander1ApplyStyleLookup(Sender: TObject);
var
  Control: Sender as TFmxObject;
  O: TFMXObject;
  Button: TSpeedButton;
begin
  O := Control.FindStyleResource('btnAddAction');
  if (Assigned(O) and (O is TSpeedButton)) then
    Button := O as TSpeedButton;
    if (Assigned(Button)) then
      Button.OnClick = btnAddActionClick;
end;