protected Display getInLinkRenderingDisplay(Ftile tile) {
   final LinkRendering linkRendering = tile.getInLinkRendering();
   if (linkRendering == null) {
     return Display.NULL;
   }
   return linkRendering.getDisplay();
 }
 protected HtmlColor getInLinkRenderingColor(Ftile tile) {
   final HtmlColor color;
   final LinkRendering linkRendering = tile.getInLinkRendering();
   if (linkRendering == null || linkRendering.getColor() == null) {
     color = rose.getHtmlColor(getSkinParam(), ColorParam.activityArrow);
   } else {
     color = linkRendering.getColor();
   }
   return color;
 }