If you can see it in the OpenGL view, you can render it via OpenGL.
Make sure you have a valid camera and render settings as usual, then go to the Render menu item in the Info Editor.. (usually on the top left of the Blender screen).
You can then use OpenGL render image or animation. This will render the OpenGL view including the cursor and any highlighted selected objects.
If you MUST have the lattice as part of a Cycles render, this can be done by combining the passes of OpenGL and Cycles render. This can be tricky if the lattice is in front or behind the object. But I think a depth mask will allow you to combine them.