Opening a ModalExtender from asplink click in gridview

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C#

ASP.NET

Ajax

I am having an issue with opening a modalextender which contains a window from clicking on an ASP LinkButton on a gridview. I need to pass a value from the row to the modal page I am showing.
Here is my code for the link button in my gridview.

<asp:TemplateField ShowHeader="False">
<itemtemplate>
  <asp:LinkButton ID="linkNew" CausesValidation="false" CommandName=""runat="server" Text="New Tx">
</itemtemplate>

I have 
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
        (e.Row.FindControl("linkNew") as LinkButton).Attributes.Add("onclick", "ShowEditModal('" + (e.Row.FindControl("lbLocator") as Label).Text + "');");
            }
}

The Javascript is:

function ShowEditModal(LocatorID) {
                 var frame = $get('IframeEdit');
                 frame.src = "Receive.aspx?UIMODE=NEW&EID=" + LocatorID;
                 $find('EditModalPopup').show();
             }

Finally the IframeEdit

<div id="DivEditWindow" style="display: none;" class="popupConfirmation">
                <iframe id="IframeEdit" frameborder="0" scrolling="no" height="400" width ="600">
                </iframe>
            </div>

The code in Receive.aspx page is this

public enum UIMODE
    {
        NEW,
        EDIT,
        VIEW
    }
    public partial class Receive : System.Web.UI.Page
    {
        public UIMODE UIMode
        {
            get
            {
                if (ViewState["UIMODE"] == null)
                    ViewState["UIMODE"] = new UIMODE();
                return (UIMODE) ViewState["UIMODE"] ;
            }
            set
            {
                ViewState["UIMODE"] = value;
            }
        }

        private string EID
        {
            get
            {
                string text = (string)ViewState["EID"];
                if (text != null)
                    return text;
                else
                    return string.Empty;
            }
            set
            {
                ViewState["EID"] = value;
            }
        }
 protected void Page_Load(object sender, EventArgs e)
        {
            //Response.Cache.SetCacheability(HttpCacheability.NoCache);
           
            if (!IsPostBack)
            {
                Validate();
                string qsUIMODE = Request.QueryString["UIMODE"];
                if (string.IsNullOrEmpty(qsUIMODE) == false)
                {
                    UIMode = (UIMODE)Enum.Parse(typeof(UIMODE), qsUIMODE);
                    EID = Request.QueryString["EID"];
                    hdnWindowUIMODE.Value = UIMode.ToString();
                }
                MultiViewReceive.ActiveViewIndex = 1;
                               
            }
        }

I can see the window popup correctly when the linkbutton is clicked, but it then dissapears right away and I need it to stay on the page.

Any help would be great. Please let me know if anything else is needed from my code as well.