private void button_LoadLevel_Click(object sender, EventArgs e)
        {
            //you can still put opendialog here
            //i use a global "levelloaded" string in a static
            //class called Global accessed through properties.
            ...
            Global.strLoadedLevel = opendialog.filename;

            Scheduler.AddEventVoidThreadSafe(LoadLevel);
        }
     
private IEnumerable<ScheduleMethod> LoadLevel()
        {
            //i use a Global.strLoadedLevel as string
            if(Global.strLoadedLevel != string.empty}
             {
                EngFun.level_load(Global.strLoadedLevel);

		//reinit camera
                InitCamera();
             }
            yield break;
        }