Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door.
Put trimmed and cleaned green beans in the steamer basket, set over the boiling water, cover, and steam until tender to the bite, 3 to 5 minutes (depending, again, on how crisp or tender you like your green beans).
Put 6-8 cups of water in sticky rice steaming pot. Then place bamboo steaming basket inside sticky rice steamer. Be sure the bottom of the bamboo steamer does not touch the boiling water. Place a standard 8 inch lid loosely over the top of the bamboo steamer. Now turn on the heat (Med/High) and steam the rice for about 40 minutes (or until tender).