code: protected void registerVerticalGroupAttributes() {
          addAttributeProcessor(new VerticalGroupAlignmentLmlAttribute(), "groupAlign");
          addAttributeProcessor(new VerticalGroupFillLmlAttribute(), "groupFill");
          addAttributeProcessor(new VerticalGroupPaddingBottomLmlAttribute(), "groupPadBottom");
          addAttributeProcessor(new VerticalGroupPaddingLeftLmlAttribute(), "groupPadLeft");
          addAttributeProcessor(new VerticalGroupPaddingLmlAttribute(), "groupPad", "padding");
          addAttributeProcessor(new VerticalGroupPaddingRightLmlAttribute(), "groupPadRight");
          addAttributeProcessor(new VerticalGroupPaddingTopLmlAttribute(), "groupPadTop");
          addAttributeProcessor(new VerticalGroupReverseLmlAttribute(), "reverse");
          addAttributeProcessor(new VerticalGroupSpacingLmlAttribute(), "groupSpace", "spacing");
      }
docs: VerticalGroup widget attributes.