fixed highcharts hidden render with manual reflow

vipra-ui/app/js/directives.js

@@ -2,7 +2,7 @@
  * Vipra Application
  * Directives
  ******************************************************************************/
-/* globals angular, Vipra, bootbox */
+/* globals angular, Vipra, bootbox, $ */
 (function() {
 
   "use strict";
@@ -184,6 +184,10 @@
           if ($attrs.shown) {
             $scope.$eval($attrs.shown);
           }
+          var hc = $($elem.data('target')).find('[highcharts]');
+          if(hc.length) {
+            hc.highcharts().reflow();
+          }
         });
       }
     };