vcx is included in the project. As stated my Martina the solution was to add .VCX at the end. Thanks for your feedback Tore.

>>Yes to both questions
>>
>>>>This works as expected
>>>>
>>>>DEFINE CLASS ywmp AS form
>>>>
>>>>
>>>>When I try to do the following
>>>>
>>>>DEFINE CLASS ywmp AS ultx_AutoCenteredTopForm OF ultxbase
>>>>
>>>>I receive a compilation error telling me "Unable to find Program ultxbase"
>>>>
>>>>How should I do it?
>>>
>>>Do you have a classlib (vcx) called ultxbase.vcx?
>>>And does it contain a form class called ultx_AutoCenteredTopForm?
>
>You write that it's a compilation error, is the vcx included in the project?