private void buttonX3_Click(object sender, EventArgs e)
 {
     if (_SelectButton != null)
     {
         if (MsgBox.Show("確定要刪除 '" + _SelectButton.Text + "' 課程規劃表?", "確定", MessageBoxButtons.OKCancel) == DialogResult.OK)
         {
             RemoveGraduationPlan.Delete(_SelectButton.Name);
             EventHub.Instance.InvokGraduationPlanDeleted(_SelectButton.Name);
         }
     }
 }
        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (_SelectItem == null)
            {
                return;
            }

            if (MsgBox.Show("確定要刪除 '" + GetNodeFullPath(_SelectItem) + "' 課程規劃表?", "確定", MessageBoxButtons.OKCancel) == DialogResult.OK)
            {
                SaveAdvTreeExpandStatus();
                RemoveGraduationPlan.Delete(_SelectItem.Name);
                EventHub.Instance.InvokGraduationPlanDeleted(_SelectItem.Name);
                _SelectItem = null;
            }
        }