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                                  • I'm working on a project which uses the ExpressQuantumGrid and ExpressBars. Some of the application's modules are built as DLLs. When I try to load a particular DLL an error occurs:

                                      "A class named TdxStatusBarContainerControl already exists".

                                    What am I doing wrong?

                                1 Solution

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                                There is a strict rule that you should follow when compiling a DLL: You must compile both the main module and the DLLs with those runtime packages, which contain the classes used in both modules. In your case, you should include the ExpressQuantumGrid's and the ExpressBars' (the TdxStatusBarContainerControl component is a part of the ExpressBars) runtime packages to the list of runtime packages when compiling your application and DLLs. This way, everything will work fine.

                                NOTE: This approach requires you to deploy the corresponding runtime packages with your application.

                                See also:
                                How to properly use CX Shell editors in a DLL
                                Why is it impossible to close an application which uses the ExpressNavBar hosted in a DLL?
                                How to determine which runtime packages to deploy for a VCL component