Various improvements for Editor

Source/Editor/Surface/VisjectSurfaceWindow.cs

@@ -41,6 +41,11 @@ namespace FlaxEditor.Surface
         /// </summary>
         IEnumerable<ScriptType> NewParameterTypes { get; }
 
+        /// <summary>
+        /// Event called when surface gets loaded (eg. after opening the window).
+        /// </summary>
+        event Action SurfaceLoaded;
+
         /// <summary>
         /// Called when parameter rename undo action is performed.
         /// </summary>
@@ -974,6 +979,7 @@ namespace FlaxEditor.Surface
                     _showWholeGraphOnLoad = false;
                     _surface.ShowWholeGraph();
                 }
+                SurfaceLoaded?.Invoke();
             }
             else if (_refreshPropertiesOnLoad && _asset.IsLoaded)
             {
@@ -1023,6 +1029,9 @@ namespace FlaxEditor.Surface
         /// <inheritdoc />
         public abstract IEnumerable<ScriptType> NewParameterTypes { get; }
 
+        /// <inheritdoc />
+        public event Action SurfaceLoaded;
+
         /// <inheritdoc />
         public virtual void OnParamRenameUndo()
         {