MSI Setup - custom action rollback

[Mogyi]

Hello, I am making a MSI setup with VS 2005 and have a custom action DLL added. I've been searching for a solution for my problem for a week now... My problem is exiting the custom action when the user clicks cancel on my dialog. The issue is that if I throw a InstallException, I get a error message box that refers to unhandeld exception. How can you exit a the installation from MSI without having this error message box? By exit I mean, rollback...

[HemJoshi]

In Rollback part just add the dll... I think it should work...jus try it

[Mogyi]

I added to rollback my dll too, the problem is: if I call Rollback directly nothing happens, if I say 'throw new InstallException("Canceld by user");' it rolls back nicely but before that, a general error MessageBox is shown...