expression.ShowSendToCustom
expression Required. An expression that returns one of the objects in the Applies To list.
Remarks
When a user clicks the custom button, the MailMergeWizardSendToCustom event executes.
Example
This example displays a custom button on the sixth step of the Mail Merge Wizard only for mailing labels.
Sub ShowCustomButton()
With ActiveDocument.MailMerge
If .MainDocumentType = wdMailingLabels Then
.ShowSendToCustom = "Custom Label Processing"
End If
End With
End Sub