利用 keybd_event函数可实现，如下面的代码用以实现在一个公共菜单中模拟Ctrl_F按钮以调用DBGridEH的查找对话框功能：
这是在一个ActionList中的某一Action的OnExecute事件代码。

procedure TDM.act_LocateExecute(Sender: TObject); 
var
  myPopupMenu:TPopupMenu; 
  MyDBGridEH:TDBGridEh; 
begin
  //ShowMessage(TMenuItem(TAction(Sender).ActionComponent).GetParentComponent.Name); 
  if (TAction(Sender).ActionComponent).GetParentComponent is TPopupMenu then
    myPopupMenu := (TAction(Sender).ActionComponent).GetParentComponent as TPopupMenu 
  else
    Exit; 
 
  //ShowMessage(MyPopupMenu.PopupComponent.Name); 
  if (MyPopupMenu.PopupComponent is TDBGridEh) then
  begin
    MyDBGridEH := TDBGridEh(MyPopupMenu.PopupComponent); 
    MyDBGridEH.SetFocus; 
    keybd_event(VK_Control, MapVirtualKey(VK_Control, 0), 0, 0);       //按下Ctrl键 
    keybd_event(ord(\'F\'), MapVirtualKey(ord(\'F\'), 0), 0, 0);                    //按下F键 
    keybd_event(ord(\'F\'), MapVirtualKey(ord(\'F\'), 0), KEYEVENTF_KEYUP, 0);    //放开F键 
    keybd_event(VK_Control, MapVirtualKey(VK_Control, 0), KEYEVENTF_KEYUP, 0); //放开Ctrl键 
  end; 
end;