fixed popup menu for columns

packages/datalib/src/ViewGridDisplay.ts

@@ -17,6 +17,7 @@ export class ViewGridDisplay extends GridDisplay {
     this.columns = this.getDisplayColumns(view);
     this.filterable = true;
     this.sortable = true;
+    this.groupable = true;
     this.editable = false;
     this.supportsReload = true;
   }