--- a/Framework/Viewport/WidgetViewport.cpp	Tue May 16 22:12:41 2017 +0200
+++ b/Framework/Viewport/WidgetViewport.cpp	Wed May 17 22:03:09 2017 +0200
@@ -74,6 +74,7 @@
     }
 
     backgroundChanged_ = true;
+    observers_.NotifyChange(this);
 
     return *widget;
   }
@@ -264,4 +265,13 @@
       centralWidget_->UpdateContent();
     }
   }
+
+
+  void WidgetViewport::Start()
+  {
+    if (centralWidget_.get() != NULL)
+    {
+      centralWidget_->Start();
+    }
+  }
 }