Hello everybody,

After restarting a new project I finally realized which are the steps to follow:

1. install qwt by respecting what is written in the INSTALL file coming with qwt (qmake, nmake, nmake install)
2. copy the files from the lib, src respectivly to the QTDIR lib, src
3. start a new MS-QT project
4. extend an existing widget (check custom widget howtos from qt nokia)
5. in the preprocessor in MS insert the QWT_DLL directive.

Now you can extend classes based on the QWT library.

Thank you for the support again.

Cristian