code: protected TagView getInputTag() {
          if (isAppendMode) {
              final int inputTagIndex = getChildCount() - 1;
              final TagView inputTag = getTagAt(inputTagIndex);
              if (inputTag != null && inputTag.mState == TagView.STATE_INPUT) {
                  return inputTag;
              } else {
                  return null;
              }
          } else {
              return null;
          }
      }
docs: Returns the INPUT tag view in this group.
  
  @return the INPUT state tag view or null if not exists