findTab(name)
findTab(name)
    Returns the
    
     Ab.tabs.Tab
    
    object for the specified tab name (as defined in the AXVW), or
    
     null
    
    if the tab is not found.
   
Parameters:
- 
     
name(String): tab name; 
    
     
     Example:
    
   
Set the restriction of a tabbed page:
    var restriction = ...
    
    var tabPanel = View.panels.get('tabs');
    
    tabPanel.findTab('page2').restriction = restriction;
   
