AMBARI-4051.Delete Group button is disabled in Manage Dialog in Installer. (akovalenko)

ambari-web/app/views/main/service/manage_config_groups_view.js

@@ -64,11 +64,18 @@ App.MainServiceManageConfigGroupView = Em.View.extend({
 
   didInsertElement: function () {
     this.get('controller').loadConfigGroups(this.get('serviceName'));
+    this.selectDefaultGroup();
     App.tooltip($('.properties-link'));
     App.tooltip($("[rel='button-info']"));
     App.tooltip($("[rel='button-info-dropdown']"), {placement: 'left'});
   },
 
+  selectDefaultGroup: function () {
+    if ('controller.isLoaded') {
+      this.set('selectedConfigGroup', this.get('controller.configGroups').findProperty('isDefault'));
+    }
+  }.observes('controller.isLoaded'),
+
   addButtonTooltip: function () {
     return  Em.I18n.t('services.service.config_groups_popup.addButton');
   }.property(),