Scala: Button in Table Cell does not "fire" Action -

I have a problem: I have to put buttons in some code in my table . As a rendering component, I return a button with the following code: (in this example you will find an image on the application specific and debugging code)

  class LivingTreeButton (Lt. : [Println ("I therefore print out:"); (lit. "Excl." Lt.expanded =! Lt.expanded client.refresh} Now, when I scroll to one of the  buttons  in the  table  , Then print the "I am printed" and print the button with the "xx" text. But when I press a button, nothing happens and I do not even see "fire"! Printouts. 
 
 When I define  verb {/ code> in the  button  instead of the constructor, it does not work either. 
 
 
> As a backdrop for further information: I am not blocking tables  events  or other Anything I have only got set up listeners in  JTable  
 
  peer.getColumnModel (). AddColumnModelListener (behaviourWorker) peer.getTableHeader (). AddMouseListener (behaviourWorker)  
 
 and only temporarily block my one instance in the  Tables  subclasses: 
 
  listenTo ( This.selection) =============================================== E If you publish (Block SevenViewAvvents) (PimpedTableSelectionEvent (this))}  
 
 you may be facing any one problem or there may be any wrong idea. After 2-hour od debugging I am grateful for any hint.