Have you written the code necessary to handle the requests that you're sending to the device through Control center???
Take "USBBulkLoopAutoEnum" example code as reference.
You can look for function "CyFxBulkLpApplnUSBSetupCB", which handles all the setup requests.
If you want to send some vendor commands then add code (in CyFxBulkLpApplnUSBSetupCB) similar to the one mentioned below.
if ( bType == CY_U3P_USB_VENDOR_RQT)
/* write your own to code to parse the commands*/
Thank you. It work.