Returns the dialog instances that were created and adds an optional close callback.

modules/UI/util/MessageHandler.js

      * titleKey will be used to get a title via the translation API.
      * @param message the message to show. If a falsy value is provided,
      * messageKey will be used to get a message via the translation API.
+     * @param closeFunction function to be called after
+     * the prompt is closed (optional)
+     * @return the prompt that was created, or null
      */
-    openMessageDialog: function(titleKey, messageKey, title, message) {
+    openMessageDialog: function(titleKey, messageKey, title, message,
+                                closedFunction) {
         if (!popupEnabled)
-            return;
+            return null;
 
         if (!title) {
             title = APP.translation.generateTranslationHTML(titleKey);
             message = APP.translation.generateTranslationHTML(messageKey);
         }
 
-        $.prompt(message,
-            {title: title, persistent: false}
-        );
+        return $.prompt(message, {
+            title: title,
+            persistent: false,
+            close: function () {
+                if(closedFunction) closedFunction();
+            }
+        });
     },
     /**
      * Shows a message to the user with two buttons: first is given as a
      *        the dialog is opened
      * @param defaultButton index of default button which will be activated when
      *        the user press 'enter'. Indexed from 0.
+     * @return the prompt that was created, or null
      */
     openTwoButtonDialog: function(titleKey, titleString, msgKey, msgString,
         persistent, leftButtonKey, submitFunction, loadedFunction,
         closeFunction, focus, defaultButton) {
 
         if (!popupEnabled || twoButtonDialog)
-            return;
+            return null;
 
         var buttons = [];
 
                     closeFunction();
             }
         });
+        return twoButtonDialog;
     },
 
     /**