Hi,
Investigating the AIP file that you sent, I noticed that you removed all the dialogs that should be displayed when the "Modify" button is pressed and that button takes you directly to the "ProgressDlg" dialog. Windows Installer applies, by default, the elevation shield icon on the button that takes the installation to the "ProgressDlg" dialog, if some modification that requires administrator rights will be done on the machine.
In your case no action will be performed and so, the elevation shield icon will not be placed on the "Modify" button, but its related text is displayed. In my opinion the "Modify" button is useless in your case. If you want, you can hide that button as described in the
Unable to remove the modify button thread.
If you do not want to hide it, you can add a new dialog after the "MaintenanceTypeDlg" dialog, then select the "Modify" button and add a new "Close the current dialog" published event on it, with the value "Return". That event should be placed the last in sequence.
Best regards,
Eusebiu