title: External ui-grid-menu-button
body: <p>I want to separate <code>ui-grid-menu-button</code> from the <code>ui-grid-menu</code>. So my select column buttons will be in another place.
  I tried to put a watch on the toggleMenu function and in a click on my button it should trigger and should open the list. I also tried to use the broadcast option but it's not working.</p>
  
  <p>What is the best way to do it?</p>