docs: private void initLowerLeftComponent() {
  
          HorizontalLayout placeHolderLowerLeft = new HorizontalLayout();
          placeHolderLowerLeft.setWidth("100%");
          Label newKeyLabel = new Label(m_messages.key(Messages.GUI_CAPTION_ADD_KEY_0));
          newKeyLabel.setWidthUndefined();
          HorizontalLayout lowerLeft = new HorizontalLayout(placeHolderLowerLeft, newKeyLabel);
          lowerLeft.setWidth("100%");
          lowerLeft.setExpandRatio(placeHolderLowerLeft, 1f);
          m_lowerLeftComponent = lowerLeft;
  
      }