Hiya Sajjad, Perhaps an easy way is to have a (multi)switch node whose value is triggered by the GUI event. The switch would have several children, each of which would be a separate group node. Each group node would have your target model as it's only child.
Then you would load up a variety of shaders on the stateset of each group node. Not sure what you meant by a different material, though. Hope that helps, David
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