TitleBarDrawData is now managed by GraphDataSource rather than GraphEditWindow

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/AbstractGraphDataSource.cs

         [SerializeField]
         private List<GraphElementData> m_TempElements = new List<GraphElementData>();
 
+		[SerializeField]
+		private TitleBarDrawData m_TitleBar;
+
+
+		public TitleBarDrawData titleBar
+		{
+			get { return m_TitleBar; }
+		}
 
         void OnNodeChanged(INode inNode, ModificationScope scope)
         {
             AddTypeMappings();
 
             this.graphAsset = graphAsset;
+
+			m_TitleBar = CreateInstance<TitleBarDrawData>();
+			m_TitleBar.Initialize(graphAsset);
 
             if (graphAsset == null)
                 return;

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/AbstractGraphEditWindow.cs

                     var source = CreateDataSource();
                     source.Initialize(m_LastSelection);
                     m_GraphView.dataSource = source;
-
-                    var titleBarData = CreateInstance<TitleBarDrawData>();
-                    titleBarData.title = m_LastSelection != null ? m_LastSelection.GetScriptableObject().name : "";
-                    m_TitleBarDrawer.dataProvider = titleBarData;
+					m_TitleBarDrawer.dataProvider = source.titleBar;
 
                     m_GraphView.StretchToParentSize();
                     Repaint();

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/DrawData/TitleBarDrawData.cs

 using RMGUI.GraphView;
 using UnityEngine;
+using UnityEngine.Graphing;
 
 namespace UnityEditor.Graphing.Drawing
 {
         {
         }
 
-        public string title;
+		public string title;
+
+		public void Initialize(IGraphAsset graphAsset)
+		{
+			if (graphAsset == null)
+				return;
+			
+			title = graphAsset.GetScriptableObject().name;
+		}
     }
 }