title: angular directives - Parent calls children isolated scope method
body: <p>In my angular app I've got a parent directive, say a list of some sort, that contains many child directives, say items.</p>
  
  <p>I'd like to be able to call a certain method on the children from the parent. I know in advance what children I'd be calling (by an input of start and end index of the items list). Therefore I wish to avoid using broadcast, as I don't want to call all children but just a selected few.</p>
  
  <p>Both the children and the parent have their own isolated scopes.</p>
  
  <p>How can I achieve this? </p>