This works for me:
private void dueDateUltraDateTimeEditor_AfterEnterEditMode(object sender, EventArgs e){
dueDateUltraDateTimeEditor.PerformAction(Infragistics.Win.UltraWinMaskedEdit.
MaskedEditAction.ToggleInsertionMode, false, false);
}
Thank you Greg !!!! You saved my day, Infragistics please hire Greg!