{ 
  This example shows how to assign a OnContextPopup event 
  handler to all components at runtime using SetMethodProp(). 
  (Here: OnContextPopup event handler) 
} 

  private 
    { Private declarations } 
    procedure AssignOnContextPopupEvent; 
    procedure OnContextPopup(Sender: TObject; MousePos: TPoint; 
     var Handled: Boolean); 
  public 
    { Public declarations } 
  end; 

var 
  Form1: TForm1; 

implementation 

{$R *.dfm} 

uses 
  TypInfo; 

procedure TForm1.OnContextPopup(Sender: TObject; MousePos: TPoint; 
  var Handled: Boolean); 
begin 
  with Sender as TComponent do 
    ShowMessage(Name + ' right-clicked!'); 
end; 

procedure TForm1.AssignOnContextPopupEvent; 
var 
  i: Integer; 
  PropInfo: PPropInfo; 
  Method: TMethod; 
  PEvent: ^TContextPopupEvent; 
begin 
  for i := 0 to ComponentCount - 1 do 
  begin 
    PropInfo := GetPropInfo(Components[i].ClassInfo, 'OnContextPopup'); 
    if (PropInfo <> nil) and (PropInfo^.PropType^^.Kind = tkMethod) then 
    begin 
      Method := GetMethodProp(Components[i], PropInfo); 
      if not Assigned(Method.Code) then 
      begin 
        PEvent := @Method.Code; 
        PEvent^ := OnContextPopup; 
        Method.Data := Self; 
        SetMethodProp(Components[i], PropInfo, Method); 
      end; 
    end; 
  end; 
end; 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
  AssignOnContextPopupEvent; 
end;