title: How to get group headers to span a Tablix column
body: <p>I am using Microsoft Reporting Services (rdlc, that comes with Visual Studio 2010)</p>
  
  <p>Suppose I want to create a report that has a Group Header, detail rows, and a group footer.
  (I'm using Tablix, but if there is a different way, I'm open to it).</p>
  
  <p>Now, there are several columns, but I want for the group header to span the columns.  Is that possible?</p>
  
  <p>Another question:
  Suppose I want to conditionally span columns in my detail row, is that possible? (and how?)</p>