code: public StageState withActionStates(ActionState... actionStates) {
          if (this.actionStates == null) {
              setActionStates(new java.util.ArrayList<ActionState>(actionStates.length));
          }
          for (ActionState ele : actionStates) {
              this.actionStates.add(ele);
          }
          return this;
      }
docs: <p>
  The state of the stage.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setActionStates(java.util.Collection)} or {@link #withActionStates(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param actionStates
  The state of the stage.
  @return Returns a reference to this object so that method calls can be chained together.