title: SSRS - Default to show ALL values if parameter is left blank
body: <p>My SSRS report displays a date range (2 parameters) and a multi-selectable value parameter for a field called "MeterNumber". </p>
  
  <p>What I want is for the default value of the multi-selectable parameter to show ALL values until the user specifies one of the values in the list. </p>
  
  <p>I've tried doing this by setting the general tab in the parameter properties to "Allow Multiple Values", and the Available and Default values to equaling the same value fields from the same dataset, but no go.</p>
  
  <p>Any thoughts? </p>