mxGraphModel.prototype.filterDescendants=function(a,b){var c=[];b=b||this.getRoot();(null==a||a(b))&&c.push(b);for(var d=this.getChildCount(b),e=0;e<d;e++){var f=this.getChildAt(b,e);c=c.concat(this.filterDescendants(a,f))}return c};mxGraphModel.prototype.getRoot=function(a){var b=a||this.root;if(null!=a)for(;null!=a;)b=a,a=this.getParent(a);return b};mxGraphModel.prototype.setRoot=function(a){this.execute(new mxRootChange(this,a));return a};