What is the content that you need to display on the modal widow - the news only or the whole details view page?
You can get/construct the Item url or its fields similar to approach user for the Title (or any other property you need:
Text='<%# System.Web.HttpContext.Current.Request.Url.AbsoluteUri +Eval("ItemDefaultUrl")%>' runat="server" />
which will return the entire page, or the fields you need /Content, Description, Id, etc respectively/.
In case you are using version 9.0+ you can call the respective news item in the modal window by its Id like for example:
and display it in the appropriate format.
More information about the web services is available here:
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items