title: NSTableView not redrawing under specific conditions
body: <p>I have a NSWindow with two NSTableViews and other NSViews. Since I have changed both NSTableView into view mode one of the tables, does not refresh correctly under specific conditions. 
  When another view is placed on top and then removed and released, one of the nstableviews does not refresh its contents and the removed view remains visible. The tabledata is correctly reloaded and can even be used to select from a (non-visible) row. 
  However a window resize immediately correctly refreshes and displays in both NSTableViews.</p>
  
  <p>Can anybody help? Thanks.
  John</p>