Hi, the following is a complete sample.  I would assume rsSearch is a function defined as <script>  rsSearch(var id) {     }   </script>  

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
                    AutoGenerateColumns="False" DataKeyNames="CategoryID" DataSourceID="ObjectDataSourceCategory"
                    CellPadding="4" ForeColor="#333333" GridLines="None" Font-Size="8pt" Font-Names="Verdana"
                    Width="100%" EmptyDataText="There are no categories defined" PageSize="10">
                    <Columns>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:LinkButton ID="btnDetails" runat="server" Text="Details" CausesValidation="false" />
                                <asp:LinkButton ID="btnDelete" runat="server" Text="Delete" CausesValidation="false"
                                    CommandName="Delete" />
                                <asp:Panel ID="pnlPopup" CssClass="catdetpopup" Width="450px" runat="server" Style="display: none;"
                                    Visible="true">
                                    <div style="width: 100%; height: auto; background-repeat: repeat-x; color: Black;
                                        font-family: Calibri" id="dragdiv" runat="server">
                                        <div style="float: right">
                                            <asp:Image runat="server" ID="btnClose" ImageUrl="/globalimages/close_button.gif" />
                                        </div>
                                        <div style="padding: 10px">
                                          <uc1:ucCategoryDetails ID="CategoryDetails1" Cat_id='<%# Eval("CategoryID")%>' runat="server">
                                            </uc1:ucCategoryDetails>
                                        </div>
                                    </div>
                                </asp:Panel>
                                <cc1:ModalPopupExtender ID="mdlpopup1" runat="server" TargetControlID="btnDetails"
                                    PopupControlID="pnlPopup" BackgroundCssClass="popupbackground" DropShadow="true"
                                    Drag="true" PopupDragHandleControlID="dragdiv" CancelControlID="btnClose" />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:BoundField DataField="CategoryID" HeaderText="CategoryID" InsertVisible="False"
                            Visible="False" ReadOnly="True" SortExpression="CategoryID" />
                        <asp:BoundField DataField="CategoryName" HeaderText="Category Name" SortExpression="CategoryName" />
                        <asp:CheckBoxField DataField="IsActive" HeaderText="Active" SortExpression="IsActive" />
                    </Columns>
                   
                </asp:GridView>
Css
.catdetpopup
{
    width:500px;
    height:auto;
    border:1px solid black;
    background-color:White;
}
UserControl codebehind

Partial Public Class ucCategoryDetails
    Inherits System.Web.UI.UserControl
    Private _Cat_ID As String
    Public Property Cat_id() As String
        Get
            Return _Cat_ID
        End Get
        Set(ByVal value As String)
            _Cat_ID = value
            Me.odsSubCat.SelectParameters("Cat_ID").DefaultValue = CInt(Cat_id)
          
        End Set

    End Property
End Class

Hope this Helps

DK

Thanksd to this post http://forums.asp.net/t/1126878.aspx

I think I am getting closer.

So far Source Page has these peices of code,

<script type="text/javascript">

</script>

Followed by the gridview template.

<ItemTemplate>

<asp:HyperLink ID="idTracking" runat="server" Style="position: relative" Text='<%# Eval("ItemID") %>' NavigateUrl="popUp('../ItemDetail/Default.aspx?ItemID=')"></asp:HyperLink>

</ItemTemplate>

Followed by the VB code behind.

If e.Row.RowType = DataControlRowType.DataRow Then

End If

End Sub

But still the illusive thing is just getting the ItemID into the Url Query string, why is this so difficult it makes me shake my head I can't be the only person in the world trying to do this...lol

Thanks DK, I will give this a go. Seems we are posting at the same time.

OK partially thanks to this post http://forums.asp.net/t/1126878.aspx I was able to figure this out and it works like a charm.

Fist I replace my Gridview with a Repeater, I just created the same look as the gridview using a table then dropped the table into the Repeater template.

It looks like so,

<asp:Repeater ID="ItemData" runat="server">

<ItemTemplate>

<table border="0" cellpadding="0" cellspacing="0" style="width: 95%; position: relative;">

<tr>

<td align="left" style="border-bottom: dimgray 1px dotted" valign="middle">

<asp:LinkButton ID="ItemLink" runat="server" OnClientClick='<%# Eval("ItemID") %>'

Style="position: relative" Text='<%# Eval("ItemName") %>'></asp:LinkButton>

</td>

</tr>

</table>

</ItemTemplate>

</asp:Repeater>

And the code beside looks like this,

hl.OnClientClick = "javascript:window.open('../ItemDetail/Default.aspx?ItemID=" & hl.OnClientClick & "', 'MyWindow', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,location=0,left = 390,top = 362,width=500,height=300');"

End Sub

When the link button is clicked it runs the window.open command and inserts the ItemID

Thanks Everyone!

 My appologies for not having seen your response to me. I'll just post the ViewOrder js routine that I use :

function ViewOrder(nOrder, SubmitType){
    var hidClient  = document.getElementById(hidClientAliasID);
    var hidUser_Id = document.getElementById(hidUser_IdAliasID);
    var cClient  = hidClient.value;
    var cUser_Id = hidUser_Id.value;
    var cBranch  = "";
    var WindowName = (SubmitType == "New" ? "SubmitNew" : "SubmitCancel");
    //window.alert(nOrder + "/" + SubmitType);   
    OrderModWin = window.open("AddModifyOrder.aspx?ticket=" + escape(nOrder) + "&branch=" + escape(cBranch) + "&client=" + escape(cClient) + "&user_id=" + escape(cUser_Id), WindowName, 'scrollbars=no,toolbar=no,height=410,width=880,alwaysRaised=yes,resizable=yes,location=no, status=no,screenX=400,screenY=410');
}
 

This used to be easy with the datagrid:

          <asp:HyperLinkColumn HeaderText="Product" DataNavigateUrlField="catalog_number" DataNavigateUrlFormatString="javascript:window.open('detail.aspx?id={0}',dtl,'width=400,height=300,location=no')" DataTextField="catalog_number" />  

But not the gridview's HyperLinkField:

          <asp:HyperLinkField HeaderText="Product"   DataNavigateUrlFields="catalog_number" DataNavigateUrlFormatString="javascript:window.open('detail.aspx?id={0}',dtl,'width=400,height=300,location=no')" DataTextField="catalog_number" />  

Unfortunately, it doesn't work with the gridview's hyperlinkfield.  The suggestions in the thread seem like an awful lot of overhead for simple functionality. Am I missing an option in my HyperLinkField?

The code is a little complex because you have to remember that you are not dealing with only 1 hyperlink, you are actually dealing with a number of dynamically generated hyperlinks, based on how many records are being displayed.

So you need to interact with each hyperlink as it is generated.