Can't comment on CBus directly. But can CBus output a 0-10V control signal. If it can then you can use a 0-10V RGB Driver/dimmer. This can either be used as an RGB controller when using RGB LED Strips, or as a three channel dimmer for 12V MR16 LED bulbs, or Single colour strips. By using 2 of the channels you could even use the new colour temp change strips (essentially a single strip with both warm and cold white leds). If CBus has a DMX gateway then there are a variety of DMX based LED dimmers/drivers.
We have had some success with Idratek and our 0-10V dimmers and also our GU10 bulbs on an Idratek dimmer module. So if CBus has a dimming module then the GU10 may work. What I would do is check the min load for the dimmer module for CBus, some systems have a min load, some don't and others can be programmed (like Lutron).
As a general note on LED dimming, complete 0 to 100% brightness tends not to happen with the bulbs, its more like 20% to 100%. The strips can be 0-100% but this depends on the control software and how the 0-10V signal is implemented.