I'm not sure if Neil's contributions to WixStdBA would allow you to property drive a variable from the modify/uninstall page. If they do, it would simply mean a need for a custom theme file with the check box added to the page, a variable associated with the check box, and a MsiProperty element to pass the value to the MSI on uninstall.
I think it would only require a slight tweak, such as adding SavePageSettings(WIXSTDBA_PAGE_UNINSTALL); to OnClickUninstallButton() inside of WixStandardBootstrapperApplication.cpp near line 2467. (I didn't test this, but logically it seems this is all that would be needed.)
-----Original Message-----
From: psimms [mailto:***@tycoint.com]
Sent: Monday, August 18, 2014 9:10 AM
To: wix-***@lists.sourceforge.net
Subject: Re: [WiX-users] Burn: bootstrap a single MSI, not showing BA UI at all
its an issue where I am using burn to bundle my msi and payload files together and my msi has a checkbox option when a uninstall is triggered and if the checkbox is ticked sends a variable to the msi during uninstall to drop databases, however I am not sure this is possible with the standard or even extended Burn UI, would I have to either create a custom BA or use BA functions to allow a checkbox to trigger a variable on uninstall using burn?
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