add:  cellWidget.setIcon(cellInfo.sorted ? (cellInfo.sortedAscending ? "widget/table/ascending.png" : "widget/table/descending.png") : null); 
context: qx.Proto.updateHeaderCell = function(cellInfo, cellWidget) {  var DefaultHeaderCellRenderer = qx.ui.table.DefaultHeaderCellRenderer;  cellWidget.setLabel(cellInfo.name);  cellWidget.setState(DefaultHeaderCellRenderer.STATE_SORTED, cellInfo.sorted);  cellWidget.setState(DefaultHeaderCellRenderer.STATE_SORTED_ASCENDING, cellInfo.sortedAscending);}
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/23c86a06f38fe5a93f5c3afa64973ff430ce0adb/DefaultHeaderCellRenderer.js/buggy/qooxdoo/frontend/framework/source/class/qx/ui/table/DefaultHeaderCellRenderer.js