title: Wrong size from UITableView.SizeThatFits()
body: <p>I implemented an UIPopoverController which is filled with a grouped UITableView. The number of cells in the table view can change dynamicly as long the popover is invisible. As soon as the popover becomes visible, the number of cells are fixed.</p>
  
  <p>When the popover becomes visible, i resize the popover content to the height of the table view. I use the SizeThatFits() method from the UITableView to get the table size and use this value to set the popover PopoverContentSize height.</p>
  
  <p>This works fine when the app is running. But always the first time the popover is shown after a new start of the app, SizeThatFits() delivers a wrong height (about 60 pixel to high). Has anyone an idea what this problem could be?</p>