code: function buildButtonList() {
  		var buttons=[];
  		// var i = 0;
  /*
  		buttons.push({
  			id:id_prefix + 'markers_off',
  			title:'Turn off all markers',
  			type:'context',
  			events: { 'click': setMarkerSet },
  			panel: 'marker_panel'
  		});
  		buttons.push({
  			id:id_prefix + 'markers_dimension',
  			title:'Dimension',
  			type:'context',
  			events: { 'click': setMarkerSet },
  			panel: 'marker_panel'
  		});
  		buttons.push({
  			id:id_prefix + 'markers_label',
  			title:'Label',
  			type:'context',
  			events: { 'click': setMarkerSet },
  			panel: 'marker_panel'
  		});
  */
  		$.each(mtypes, function (k, pos) {
  			var listname = pos + "_marker_list";
  			var def = true;
  			$.each(marker_types, function (id, v) {
  				var title = getTitle('en', id);
  				buttons.push({
  					id: id_prefix + pos + '_' + id,
  					svgicon: id,
  					title: title,
  					type: 'context',
  					events: {'click': setArrowFromButton},
  					panel: 'marker_panel',
  					list: listname,
  					isDefault: def
  				});
  				def = false;
  			});
  		});
  		return buttons;
  	}
docs: build the toolbar button array from the marker definitions TODO: need to incorporate language specific titles