This is because you set library to... without clearing the library from memory when is no longer needed.

Vlad

>I have the following code in the init method of a form.
>
>
>SET CLASSLIB TO controls IN SEA.APP ALIAS lcl_class ADDITIVE
>THIS.AddObject("Grd_Orders","or_returns_pick_orno_grid")
>
>
>Everyting works fine but when I return to the project manager and try to build the app the next time I get the following message:
>
>Object File "D:\Appdevelopment\Sea\Sea.app" is in use and cannot be removed from memory.
>
>Does anyone know what's going on.