Resolution problem for 1440 x 900 solved

My Laptop had a problem with not being able to play CF in 1440x900. My original setup at home is a 1440 x 900 monitor on top and with the native 1600 x 900 laptop display on bottom as my main display. Regardless-- when i detached the 1440 x 900 monitor- when i try to play CF 1440 x 900 resolution the game would tell me that my laptop display does not support 1440 x 900. As a result- the only way i can play 1440 x 900 resolution is if my 1440 x 900 monitor is attached even though i'm not playing CF on it. At this time 1440 x900 was not a choice in the 'screen resolution' control panel option for my laptop display. The way i solved this was by going into Nvidia Control Panel and went to the 'change resolution' selection and created a 1440 x 900 resolution manually. From that point on my computer was able to set the customized display as a default setting. Going back into the game i was successfully able to set the in game resolution to 1440 x 900.