控件代码如下:<script?runat="server">...????private?void?Calendar1_SelectionChanged(?System.Object?sender,?System.EventArgs??e??)????...{????????TextBox1.Text?=?Calendar2.SelectedDate.ToShortDateString();????????Panel1.Visible?=?false;????????}????private?void?OnClick(?System.Object?sender,?System.EventArgs??e??)????...{?????????if?(?Panel1.Visible?)???...