diff --git a/demo/digesttreescene.h b/demo/digesttreescene.h
new file mode 100644
index 0000000..0d98f7e
--- /dev/null
+++ b/demo/digesttreescene.h
@@ -0,0 +1,17 @@
+#ifndef DIGESTTREESCENE_H
+#define DIGESTTREESCENE_H
+
+#include <QtGui/QGraphicsScene>
+#include "ogdf/basic/GraphAttributes.h"
+#include "ogdf/basic/Graph.h"
+
+class DigestTreeScene : public QGraphicsScene
+{
+  Q_OBJECT
+
+public:
+  DigestTreeScene(QWidget *parent = 0);
+private:
+  ogdf::Graph m_graph;
+};
+#endif