[Wine] Mac OS X, X11, resolution problem

[doh123]

I'm trying to run a game in full screen mode that cannot change my resolution to 640x480...

the error message is
err:x11settings:X11DRV_ChangeDisplaySettingsEx No matching mode found 640x480x32 @0! (NoRes)

how would I go about doing something to add this available resolution so it can auto switch?

I know its possible as Crossover can do it fine... just not when i use standard Wine.