wip

panning.js

@@ -29,11 +29,11 @@ export const panning = function(superClass) {
     }
 
     firstUpdated() {
-      super.firstUpdated();
       this.canvas = this.shadowRoot.querySelector('.canvas');
       this.addEventListener('mousedown', this._startDrag.bind(this));
       document.addEventListener('mousemove', this._drag.bind(this));
       document.addEventListener('mouseup', this._endDrag.bind(this));
+      super.firstUpdated();
     }
 
     _getTopNodeAtPoint(x, y) {