add annotation event from annotation panel

static/js/annotationPanel.js

@@ -10,6 +10,10 @@ oml.ui.annotationPanel = function() {
         title: 'add',
         tooltip: Ox._('Add Quote'),
         type: 'image'
+    }).bindEvent({
+        click: function() {
+            oml.$ui.viewer.postMessage('addAnnotation', {})
+        }
     }).appendTo($bar);
 
     var $menuButton = Ox.MenuButton({
@@ -50,6 +54,12 @@ oml.ui.annotationPanel = function() {
         orientation: 'vertical'
     });
 
+    that.updateSelection = function(selection) {
+        $button.options({
+            disabled: !selection
+        })
+    }
+
     return that;
 
 };