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dhtmlxlayout in Tabbar

I have a tabbar with three tabs. I want to place a dhtmlx Layout in one of them and it does not work
My javascript code is this

function createObservationsInterItemTab(interItemTab){

var intraItemObsdiv = createIDNode("div","intraItemObsdiv");
interItemTab.setContent("observationsInter_tab", intraItemObsdiv);

interItemLayout = new dhtmlXLayoutObject(intraItemObsdiv,"4I","dhx_blue");

interItemLayout.setEffect("highlight",false);
interItemLayout.setAutoSize("a;b;c;d","a;b;c;d");

interItemLayout.cells("a").setHeight("20");
interItemLayout.cells("a").setWidth("750");
interItemLayout.cells("b").setHeight("210");

Please, see attached sample with layout inside tabbar. Possibly it will help to resolve the issue.