Installshield使用用户输入值修补XML文件更改

I'm using InstallShield 2010 to create a patch of my product. There are many changes so I am using the patch design view to create a MSP patch that differences my original product release MSI and the current MSI. My installer uses the XML file changes InstallShield feature to write XML file values during installation. Some of the values written are collected via custom dialogs during install. My issue is that when applying the patch these values are NULL because there are no user dialogs shown during the MSP patch installation. What happens is since the values are not populated from user input, the MSP will put blank values into the XML which essentially deletes the values that the user specified during the initial installation. Can I add dialogs to the patch so I can re-collect the necessary values from the user during patch install?I'm using InstallShield 2010 to create a patch