view problem within cc1:ModalPopupExtender ..

I have a view problem within cc1:ModalPopupExtender .. when I click an asp image button the specified panel located most top-left in a page even I do not use x or y ModalPopupExtender properties

this problem happens only with ie

in firefox everything works fine ..

here is ModalPopupExtender code :

<cc1:ModalPopupExtender ID="ModalPopupExtender3" runat="server"
TargetControlID="submitBuyImgBt"
PopupControlID="Panel1"
BackgroundCssClass="modalBackground"
DropShadow="true"
OkControlID="OkButton"
OnOkScript="onOk()"
CancelControlID="CancelButton" />

any help would be greatly appreciated

why it's position always in top left side of the page ?

what does the css look like for the panel? are you using one?

heres what i always use and it shows up at the center of the screen.

<ajax:ModalPopupExtender ID="mpeEditUserForm" runat="server" TargetControlID="btnEditUser" BackgroundCssClass="modalBackground"
PopupControlID="pnlUserModal" />
<asp:Panel ID="pnlUserModal" runat="server" CssClass="modalPopup" Style="display:none; padding:3px 3px 3px 3px" Width="320px">

css:

.modalBackground
{
background-color:Gray;
filter: alpha(opacity=70);
}
.modalPopup{
background-color:White;
border: solid 3px Gray;
padding: 3px 3px 3px 3px;

font-size:medium;
}

Mezzaluna:

what does the css look like for the panel? are you using one?

heres what i always use and it shows up at the center of the screen.

<ajax:ModalPopupExtender ID="mpeEditUserForm" runat="server" TargetControlID="btnEditUser" BackgroundCssClass="modalBackground"
PopupControlID="pnlUserModal" />
<asp:Panel ID="pnlUserModal" runat="server" CssClass="modalPopup" Style="display:none; padding:3px 3px 3px 3px" Width="320px">

css:

.modalBackground
{
background-color:Gray;
filter: alpha(opacity=70);
}
.modalPopup{
background-color:White;
border: solid 3px Gray;
padding: 3px 3px 3px 3px;

font-size:medium;
}

I have CSS but it's still not working .. but both panel and moalPopupExtender located in a web user control ( .ascx )

does the problem because of this ?

Note that every thing works fine in firefox. however not fine in ie6 or above

Not sure on that then. I always have the opposite problem. I get things to work in IE and they fail in Firefox.