code: public void setHeight(int height) {
  
          if (height <= 0) {
              m_containerElement.getStyle().clearWidth();
              m_main.getStyle().clearHeight();
          } else {
              int contentHeight = height - 6;
              if (hasCaption()) {
                  contentHeight = contentHeight - 36;
              }
              if (hasButtons()) {
                  contentHeight = contentHeight - 34;
              }
              contentHeight = contentHeight - m_contentHeightCorrection;
              m_main.getStyle().setHeight(contentHeight, Unit.PX);
          }
      }
docs: Sets the height for the popup content.<p>
  
  @param height the height in pixels