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Thanks for looking at this.

Since its been a year that I asked this question. Here is what I did at the time to get it working:

<iggrid:TemplateDataField Key="ReferenceColumn" Hidden="True">       

<ItemTemplate>              

<asp:Panel ID="explink" runat="server" >          

</asp:Panel>          

</ItemTemplate>          

<Header Text="Reference" />    

</iggrid:TemplateDataField>

Code behind in InitializeRowEvent:

string[] link;              

string itemId;             

string linkURL;              

string refText = e.Row.Items.FindItemByKey("ReferenceColumn").Value.ToString();                

if (refText.IndexOf(Environment.NewLine) > 0)

                    {                       

foreach (string refLink in refText.Split(new string[] { System.Environment.NewLine }, StringSplitOptions.None))

                        {                          

if (refLink.Trim().Length > 0 && refLink.IndexOf("|") > 0)

                            {

                                link = refLink.Split("|".ToCharArray());

                                itemId = link[0].Replace("XX-ING-ADV:", "");

                                linkURL = CriticalWatch.HttpUrlBuilder.BuildUrl("~/ListView.aspx", "OU=" + ou + "&ItemId=" + itemId);

                                var panellink = ((Panel)e.Row.Items.FindItemByKey("ReferenceColumn").FindControl("explink"));

                                HyperLink h =new HyperLink();

                                h.NavigateUrl ="BLOCKED SCRIPTopenPopupWindow('" + linkURL + "','newwin',500,500,'yes');";

                                h.Text = linkURL +"</br>";

                                panellink.Controls.Add(h);

                            }                          

                        }

                    }            

else

if (refText.Trim().Length > 0)

                        {                       

if (refText.IndexOf("|") > 0)

                            {

                                link = refText.Split("|".ToCharArray());

                                itemId = link[0].Replace("XX-ING-ADV:", "");

                                var panellink = ((Panel)e.Row.Items.FindItemByKey("ReferenceColumn").FindControl("explink"));

                                HyperLink h =new HyperLink();

                                h.NavigateUrl ="BLOCKED SCRIPTopenPopupWindow('" + linkURL + "','newwin',500,500,'yes');";

                                h.Text = linkURL +"</br>";

                                panellink.Controls.Add(h);

                            }

                        }

                        refText.Replace(Environment.NewLine,"<br/>");

                    }

Hello,

In order to achieve this functionality, you could modify the aspx file in the markup and add <br>

tags like this: