How to add moving obstacles to "turtlebot_stage"

[airjohnson]

Hi,
I'm trying to add moving obstacles to the "turtlebot_stage". According to the tutorial (http://wiki.ros.org/turtlebot_stage/Tutorials/indigo/Customizing%20the%20Stage%20Simulator), moveable objects can be added to the map.
I tried to add velocity definition to the "myBlock.inc" and "maze.world" files, and I also referred to the model file definition (http://wiki.ros.org/turtlebot_stage/Tutorials/indigo/Customizing%20the%20Stage%20Simulator). But the obstacle only moves when it is dragged by the mouse. It doesn't move by itself.
Is it possible to add moving obstacles to the "turtlebot_stage"?
If so, what should I do?
I really appreciate your help. Thanks a lot!

[tfoote]

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