Replaced Mesh with AbstractMesh

src/Behaviors/Mesh/babylon.pointerDragBehavior.ts

@@ -2,9 +2,9 @@ module BABYLON {
     /**
      * A behavior that when attached to a mesh will allow the mesh to be dragged around the screen based on pointer events
      */
-    export class PointerDragBehavior implements Behavior<Mesh> {
+    export class PointerDragBehavior implements Behavior<AbstractMesh> {
         private static _AnyMouseID = -2;
-        private _attachedNode: Mesh;
+        private _attachedNode: AbstractMesh;
         private _dragPlane: Mesh;
         private _scene: Scene;
         private _pointerObserver: Nullable<Observer<PointerInfo>>;
@@ -117,7 +117,7 @@ module BABYLON {
          * Attaches the drag behavior the passed in mesh
          * @param ownerNode The mesh that will be dragged around once attached
          */
-        public attach(ownerNode: Mesh): void {
+        public attach(ownerNode: AbstractMesh): void {
             this._scene = ownerNode.getScene();
             this._attachedNode = ownerNode;