/// <summary>
        /// 选择某个题目
        /// </summary>
        private void SelectSubjectEventHandle()
        {
            if (this.panelChild.Controls == null || this.panelChild.Controls.Count == 0)
            {
                return;
            }
            var currentCtrl = this.panelChild.Controls[0] as SubjectQueryCtrl;

            if (currentCtrl == null)
            {
                return;
            }
            if (string.IsNullOrEmpty(currentCtrl.CurrentId))
            {
                return;
            }
            var id = Guid.Parse(currentCtrl.CurrentId);

            if (id == null)
            {
                return;
            }
            SubjectAddCtrl ctrl = new SubjectAddCtrl(id);

            ChangeFormTo(ctrl);
        }
        private void menuItemAddSubject_Click(object sender, EventArgs e)
        {
            SubjectAddCtrl ctrl = new SubjectAddCtrl();

            ChangeFormTo(ctrl);
        }