In order for the buttons on your OKIOCAM to be functional within the OKIOLABS applications, OKIOCAM Button Driver needs to be installed. You can find the button driver on the OKIOLABS' website under the download section. While you can still use the OKIOCAM extension without the driver, the buttons on the camera will not function without the driver.
It is important to note, however, that regardless of whether you have the Button Driver installed or not, only the gray button will work within third-party applications. The gray button adjusts the camera's focus, exposure, and white balance settings automatically.