Particle system texture influencing density of the PS - missing UV mapping

[pixelwerkstudio]

HI,

i am modeling a terrain, with grass scattered on it, using particle system.

So I've created the B/W image to influence and control the density of the grass... i create the texture slot... trying to set the UV mapping... but the menu option is empty.
Any hints and suggestions how to solve this...

thanks..

[bdancer]

Please, sent me a test scene and I'll fix this.