> which delphi package i must compile for affecting the changes
>

Ibrahim,
You don't need to. Just add the source directory to the library path
and the new code will be compiled into your app. If you build with
packages remember to remove the IBX package from the runtime packages
list.
If you really want the hassle of recompiling the packages then you
will need to create a new one because I don't think the .pkg files are
distributed. Just create a new package project, add all the IBX source
files and build. Add the new package to the runtime packages list and
all should be ok.

Regards,
Will.