When i use vfp 7, i always meet a bug: if i modify a form or a class,after i add some custom method to it, and call these method in another event---when i type the custom method's "()",VFP got a crash!

I find the way to figure out this problem is: after add the custom method, save the class/form immdiatelly, then compile it.But when i compile some classlib, there always display the dialog "file is in use",even after i use the next code first:

Set Classlib to myclasslib
Release Classlib myclasslib

Compile Classlib myclasslib_fullpathname &&error was start at here

I am sure that there have not a class of this classlib is modifing or having a instant, but the problem is still reside.How can i do?

thanks!