ASP.Net Panel ScrollBars not appearing in Chrome browser when content overflow

 <cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="Button3"                 BehaviorID="popup1" PopupControlID="Panel2" BackgroundCssClass="modalBackground"                 OkControlID="cmdclose" />             <asp:Panel ID="panel2" BackColor="Silver" BorderStyle="Solid" BorderWidth="4"  BorderColor="ActiveBorder" Width="775px"                 Height="550px" runat="server"> <grid>    </asp:Panel>  i have the above it wroks fine in IE & FF  but in chrome 1)if more rows  grid appeasr out of panel without scroll bar (same wroks fine in IE & FF) 2) when clicked any where the grid disppaears or close but in IE & FF it closes only on cmdclose