code: @Override
      public ModalWindow setInitialWidth(final int _initialWidth)
      {
          int width = _initialWidth;
          final WebClientInfo wcInfo = (WebClientInfo) getSession().getClientInfo();
          if (wcInfo.getProperties().getBrowserWidth() > 0 && wcInfo.getProperties().getBrowserWidth() < _initialWidth) {
              width = wcInfo.getProperties().getBrowserWidth();
          }
          return super.setInitialWidth(width);
      }
docs: Check it the size of the modal window is not to big and reduces it if
  necessary.
  
  @see org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow#setInitialWidth(int)
  @param _initialWidth width
  @return this Modalwindow