AX 2012 showing third party website in EP/Sharepoint dialog

We recently had a requirement to show a third party website in our EP site. The requirement was to show the website in Enterprise Portal dialog and URL was not static. We had to build URL at runtime by using fields from the selected record. As you know, we cannot write code on EP list page (we can use interaction class but we cannot write c# code for list page), so options were very limited. We added a Menu item button on List page and passed the selected record as context to that button. The button was pointing to a new web control (or sharepoint page) and we kept this page blank. All it had was an IFrame. See sample HTML below.

<dynamics:AxDataSource ID="dsCustTable" runat="server" DataSetName="dsCustTable" ProviderView="CustTable"></dynamics:AxDataSource>
<div style="height: 100%">  
    <iframe id="LinkOneFrame" runat="server" height="800" width="100%" ></iframe>
</div>

Now, we need to load our page in that IFrame. First thing was to get the URL as it is not a static URL but we need to build that on fly. We created a static method on table to build that using x++ and returned the URL from x++.

Following is the c# code to get the URL and load the page in URL.

linkOneURL = this.dsCustTable.GetDataSet().DataSetRun.AxaptaObjectAdapter.Call("BuildLinkOneURL").ToString();

this.LinkOneFrame.Attributes.Add("src", linkOneURL);

When you click the button on list page a new popup dialog would open and it would show the page in Iframe.