I created a dialog using the resource dialog editor and created a class derived from CPropertyPage for it in the ClassWizard. I tried including the class in a file I created myself and I get these errors from the compiler: <br><br>newsysdc1.h(24) : error C2065: 'IDD_NewSysD1' : undeclared identifier<br>newsysdc1.h(24) : error C2057: expected constant expression<br><br>The file I created compiles fine without the #include "NewSysDC1.h"<br>I don't want to try to fix anything myself in the NewSysDC1.h file because it was generated by the Class Wizard. The strange thing is that the NewSysDC1.cpp file compiles fine. Any ideas or suggestions? Your help is greatly appreciated. Thanks.