This example demonstrates how to display the Customization Form near the Pivot Grid.
The form is in SplitContainerControl - a parent container for the Pivot Grid and Customization Form. To specify the SplitContainer's panel as the Customization Form's owner, handle the PivotGridControl.ShowingCustomizationForm event and use the e.ParentControl property.
Specify the form's appearance with the PivotGridOptionsCustomization.CustomizationFormStyle property.
Call the PivotGridControl.FieldsCustomization method to show the form.
Pivot Grid for WinForms - How to Group Fields into Folders in the Customization Form