datatable.addEventListener('sort', log.bind(app, 'datatable'));
				app.$.datatable.addEventListener('selection-changed', log.bind(app, 'datatable'));
				app.$.datatable.addEventListener('row-tap', log.bind(app, 'datatable'));
				app.$.datatable.addEventListener('cell-tap', log.bind(app, 'datatable'));
				app.$.datatable.addEventListener('toggle-all', log.bind(app, 'datatable'));
				var columns = document.querySelectorAll('paper-datatable-column');
				for(var i=0;i<columns.length;i++){
					columns[i].