title: unable to create instance for UITableViewCell in UIViewController
body: <p>I am using tableview to list my products. In "cellForRowAtIndexPath", with the help of "dequeueReusableCellWithIdentifier", we can access property of UITableViewCell. For Example,</p>
  
  <pre><code>func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -&gt; UITableViewCell {
  
  var cell1 = product_tableview.dequeueReusableCellWithIdentifier("productmain", forIndexPath: indexPath) as product_tblCell
  
  cell1.label1.text = "PRODUCT 1"
  return cell1
  }
  </code></pre>
  
  <p>but, if we want to use outside of this scope, within this viewController itself, how can we access that UITableViewCell property?</p>
  
  <p>If I create like this any of UIButton action in this viewController,</p>
  
  <pre><code>var prop_cell = product_tableview.dequeueReusableCellWithIdentifier("productmain") as product_tblCell 
  
  prod_cell.label1.text = "PRODUCT 5"
  //NO ERROR SHOWN. BUT FATAL ERROR IN DEBUG AREA.
  //UNABLE TO RUN
  </code></pre>
  
  <p>I am getting fatal error.
  This is my major doubt in UITableView. Kindly response this. Don't simply De-Vote. Kindly guide me.</p>