Success! Here is what I did:
Open file and cut and paste one leaf into an separate mesh.
Choose Paint Utililtes and Add a Color Texture. (try to paint but can't)
Select leaf and open UV utilities. Select UV Projection Tool, select Planar, click on leaf, choose proper axis to give a top down map.
Select the Image Map that modo made for the color texture. Under its Texture Locator properties change the Projection Type to UV and the UV map to the planar one just created.
Select the mesh, and the image map in the item tree. Open the paint tools and it should work.
It is unfortunate that your model will not import as separate meshes but there is a script to do this for you on vertex monkey.
http://www.vertexmonkey.com/download...J_separate.zip
Hope this is leads you to a solution.
All the best,
Ed