title: Reflect DataSet update in tablix
body: <p>I have a report, and it calls a stored PROC. My dataset was bound to this pulling in (for example) three fields. I have now updated this proc to pull a few more additional fields. I refreshed the DataSet to pull the new fields, and in my "Report Data" window, these changes can be seen. I cannot figure out how to update the Tablix to show the new fields. </p>
  
  <p>The closest I can find anyone referring to this is in threads like <a href="https://stackoverflow.com/questions/21914345/ssrs-dataset-field-refresh-not-updating-for-tablix">this</a>, but they all seem to refer to how to update the DataSet. For me, the set has been updated already (via refresh fields), the new fields are not coming through. </p>