title: Admin generator - visible or not action
body: <pre><code>config:
    list:
      object_actions:
        extend:     ~
        _edit:      ~
        _delete:    ~
  </code></pre>
  
  <p>Is possible to show action extend only if in database in this same record is set field <strong>visible</strong> on 1?</p>
  
  <p>For example:</p>
  
  <pre><code>config:
    list:
      object_actions:
        extend:     if(this.status == 1 then SHOW else if (this.status == 0) then NOT SHOW
        _edit:      ~
        _delete:    ~
  </code></pre>
  
  <p>in database i have for example:</p>
  
  <pre><code>id | name | extend | visible
  1  | aaa  |  0     | 0          
  2  | bbb  |  0     | 1
  3  | ccc  |  0     | 1
  4  | aaa  |  0     | 0
  5  | bbb  |  0     | 1
  6  | ccc  |  0     | 1
  </code></pre>
  
  <p>so if visible == 1 then should show me action extend in admin generator</p>