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mxGraph loading from XML but cant insert element after it is loaded

here is the code

onSave(){ var encoder = new mxCodec(); var result = encoder.encode(this.graph.getModel()); this.dataToSave = mxUtils.getXml(result); }        onLoad(){          var doc = mxUtils.parseXml(this.dataToSave);     var codec = new mxCodec(doc);     codec.decode(doc.documentElement, this.graph.getModel());     }

but at the end it wont add something like this note:it will add it before the load button is clicked

this.graph.insertVertex(this.g7, 'c3', this.getGroup(1), 95, 90, 110, 50,'child');
Asked on July 17, 2020 in XML.
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