>Hi all,
>
>I tried to define some class in a header file and use them in another program, however, I've some problem..
>
>FormDefine.h
>

>define class oForm as form
>  autocenter=.T.
>  caption="Testing"
>
>  procedure queryunload
>    clear event
>  endproc
>enddefine
>

Cetin told you the right way to do this, and the reason why the above was the wrong way is in the way VFP uses .h files - it takes only #define and other # lines from it, and ignores any other lines there. It's only for precompiler directives; you can't have code there. And you don't need to have it there; with Set Procedure ... Additive, and class libraries, you have it all.