Install Shield，如何检查退出代码但不显示错误？

I have a custom action that runs in the very beginning of my Install Shield Project. I check the exit code on this custom action because it is a form that has a next and cancel button, if the user cancels the install should NOT proceed, if they select next it should (thus I check the exit code). However I don't want the user to see an install-Shield error message when they select cancel. Is there anything I can do? I have install shield 2010I have a custom action that runs in the very be