Hi, I have a dialog based app that has a four page property sheet and a lots of controls on it. I have just copied and pasted a couple of dialog boxes from another app into my dialog based app and now it is crashing. I am fairly certain that my code is right. I did stumble across the resource.h file and I discovered that the values assigned to the resources were no longer unique and some resouces shared the same number. I have looked in MSDN for help and they talk about ranges of value that resourses are allowed to occupy but I did not fully understand what I was reading. Can anyone tell me if resource value have to be unique? If so, then how do I fix them and change them to correct values, and what values that should be? Also, can anyone tell me if the resource files is even related to the problems I am experiencing? Thanks.