message: fixed add column
diff: @@ -144,7 +144,7 @@ export class ColumnCollection<rowType extends Entity<any>> {
  this.colListChanged();
  }
  addCol(col: DataControlSettings<any>) {
  - this.items.splice(this.items.indexOf(col) + 1, 0);
  + this.items.splice(this.items.indexOf(col) + 1, 0,{});
  this.colListChanged();
  }
  