Terrain->no ,,Create lightmap" button

When I press the "Terrain" button in Unity 3.0 (I have a directional light and a terrain with texture), there is no "Create lightmap" button.

Help please!

You create the light map in the standard lightmapper. Go to Window/Lightmapping. Then it will bring up all the lightmapping options. Just make sure to mark the terrain static in the inspector window. Then do your standard lightmapping explained here.

Thanks, I've found it.