code: public void setActionStates(java.util.Collection<ActionState> actionStates) {
          if (actionStates == null) {
              this.actionStates = null;
              return;
          }
  
          this.actionStates = new java.util.ArrayList<ActionState>(actionStates);
      }
docs: <p>
  The state of the stage.
  </p>
  
  @param actionStates
  The state of the stage.