you can define like this
headerContent : [ new sap.ui.ux3.ThingGroup({id : "id3",title : 'Company Info',content : infoMatrix}), new sap.ui.ux3.ThingGroup({title:'Title Instructions',content:titleInst}), ],
and then define the content of the thinggroup
var infoMatrix = new sap.ui.commons.layout.MatrixLayout({layoutFixed:false,width:'100%',columns: 2}); infoMatrix.createRow( leftCell.clone().addContent(new sap.ui.commons.Label({text:"Company ID"})), rightCell.clone().addContent(new sap.ui.commons.TextField({value:'1115646'})) ); infoMatrix.createRow( leftCell.clone().addContent(new sap.ui.commons.Label({text:"Mail Documents?"})), rightCell.clone().addContent(new sap.ui.commons.TextView({text:'Y'})) ); infoMatrix.createRow( leftCell.clone().addContent( new sap.ui.commons.Label({text:"Mailing Address"})), rightCell.clone().addContent(new sap.ui.commons.TextArea({rows:4,value:'1234 Street Dr.,Anywhere St})) );