problem with popup date picker in gridView

when i select date from the popup calendar nothing happen . the textbox empty (the date does not selected) and the window does not close.
<asp:TemplateField HeaderText="DateOfBirth" SortExpression="DateOfBirth"> <ItemTemplate> <asp:Label runat="server" ID="lblDateOfBirth" Text='<%#Eval("DateOfBirth","{0:d}") %>' /> </ItemTemplate> <EditItemTemplate> <asp:TextBox ID="tbDateSelect" runat="server" Text= '<%#Eval("DateOfBirth","{0:d}") %>' /> <a href="javascript:;" onclick="window.open('Popup.aspx?textbox=tbDateOfBirth','cal','width=300,height=225,left=270,top=180')"> <img alt="calendar btn" src="image/calendar_button.png" st ...