private void buttonEdit_Click(object sender, EventArgs e)
 {
     if (listBox1.SelectedIndex > -1)
     {
         CustomTimersManagerEditForm ui = new CustomTimersManagerEditForm(wurmApi,
                                                                          (TimerDefinition)listBox1.SelectedItem, timerDefinitions);
         ui.FormClosed += OnTimerAdded;
         ui.ShowCenteredOnForm(this);
     }
 }
        private void buttonAdd_Click(object sender, EventArgs e)
        {
            //display window to add
            CustomTimersManagerEditForm ui = new CustomTimersManagerEditForm(wurmApi,
                                                                             new TimerDefinition(Guid.NewGuid())
            {
                RuntimeTypeId = RuntimeTypeId.LegacyCustom
            }, timerDefinitions);

            ui.FormClosed += OnTimerAdded;
            ui.ShowCenteredOnForm(this);
        }