added undo to nobuttons

x3d_web_viewer/help.js

@@ -17,7 +17,7 @@ function init_help(element){
 </tr>\
 <tr>\
     <td valign='top'>&nbsp;&nbsp;&nbsp;&nbsp;<b>&#8226; right-click:</b></td>\
-    <td valign='top'>hide part and its copies</td>\
+    <td valign='top'>hide part and its copies. <b>undo</b>-button to unhide</td>\
 </tr>\
 <tr>\
     <td valign='top'>&nbsp;&nbsp;&nbsp;&nbsp;<b>&#8226; right-click + move:</b></td>\

x3d_web_viewer/viewmodel.js

@@ -274,6 +274,7 @@ X3DOM Flash version is not available.<br/>\
     $("#v7").css({cursor:"pointer"}).click(function(){element.runtime.resetView();});
     
     if (nocontrols) {
+        undo_model.css({display:"none"});
         rst_model.css({display:"none"});
         hlp.css({display:"none"});
         $("#thrd").css({display:"none"});