title: sending data from one sublayout to another in sitecore
body: <p>I'm having a hard time building a filtering system in Sitecore 7.</p>
  
  <p>I have 2 sublayouts, on the same level of the page. </p>
  
  <p>Sublayout A is a sidebar that contains a list of checkboxes and has an event that populates a List with the selected values. 
  Sublayout B displays a set of items. </p>
  
  <p>What I would like to do, is send the populated List from sublayout A to sublayout B in order to filter the items list based on what the user selected. 
  I was able to do this by passing the data through Session, but this is not an optimal way of handling that data. </p>
  
  <p>I've tried defining a property for sublayout A and loading the list there, but I can't get the exact instance of sublayout A from sublayout B in order to read the populated property. 
  Also, trying to Page.FindControl("IdOfSomeElementFromSublayoutA") always returns null in Sublayout B. Even though I've casted Page as the .aspx page that contains both Sublayouts.</p>
  
  <p>I'm using Sitecore 7 Update 2. </p>
  
  <p>Thanks a lot for your time. </p>