The field chooser is a pivot grid element that allows you to manage the displayed fields. You can invoke it by clicking the Field Chooser icon at the top-left corner or by selecting the "Show Field Chooser" command on the PivotGrid's context menu. Changes made in the field chooser can be applied to the PivotGrid in instant or on-demand mode. In the latter case, the field chooser is supplied with the OK and Cancel buttons.