docs: public void showMainForm(String userName) {
          align();
          changeUserName(userName);
  
          mainForm.addMember(header); 
          mainForm.addMember(repositoryHeader);
          mainForm.addMember(viewPort);
          mainForm.addMember(strut(30));
          mainForm.addMember(footer);
             
          setLayoutWidth(LAYOUT_WIDTH);     
          loadData();
          
          //init HTML history
          htmlHistory.addValueChangeHandler(this);
          mainForm.draw();        
      }