Controlling VMB4DC

I have been looking at the VMB4DC module to control some RGB LED strips connected via dimmer but I am a little unclear as to how it is controlled using pushbuttons. I would like to be able to control the colour of the RGB LED strips using only a few buttons. It is possible to have one pushbutton to control the 3 channels, to be able to move through the rainbow of colours created by mixing the RGB. Similar to push and holding a button to dim a light, but in this case to change colour. Or alternatively, be able to cycle through different preset colours, eg. by pushing one button be able to cycle through red->blue->green->yellow->etc.