Many programs allow windows users to be able to control what is visible and hidden in the system tray. Looking at Pandora Radio, it provides options to work with this. You will see from my screen shot that they allow you to select Always show in system tray so that it remains visible and also Hide when minimized. This would be a better option than the use the X to minimize the window when X should be used to close out the program. Hope this will help fine tune an awesome program!