You can customize your Create bar by creating a list of favorites. This allows you to easily access your most commonly used shaders.
The Hypershade sorts your favorites in categories to enable you to locate your shaders easily.
You can also create your Favorites list via the Create Render Node window and the Assign New Material window. The Create Render Node window and Assign New Material window have the same functionality as the HypershadeCreate Bar. Any Favorites list that you create in the Hypershade also appears in the two other two windows and vice versa.
The materials are ordered by Maya Surface, Maya Volumetric, and mental ray materials (if the Mayatomr.mll plug-in is enabled).