STM32 Composite Device Microcontroller

Hi there, I'm in the process of building a USB composite CDC + MSC device on the STM32F4 Discovery board but i am having trouble to connect to the COM Port when using the composite device. My MCU is the STM32F407IG. I managed the get a working composite device with working driver inf files. I can choose between all combinations of cdc,hid and msc. But i can't connect to my serial com port. I want to use this com port as a uart bridge but it's not working because i can't connect to the com port when using composite. My aim is that the I can connect The MCU with USB FS and get 2 Devices one COM Port CDC and one MSC Device. Through the COM Port i want to send data to UART(this part i already implemented and it's working in a standalone version). And through MSC i want to send Data to any GPIO on my MCU, but that task is optional. The Main task would be to get my UART Communication example (which is already working as a Standalone) also working as a Composite Device in combination with MSC. I will attach the working Standalone Version of CDC which works and a Version of my Composite Device Example, were i can't connect to the Serial COM Port. I hope you understand the task and my issue. any questions let me know :)