It couldn't be easier:
Quadro Compact full-extension runner
Cooking, baking, keeping warm: the Quadro Compact telescopic runner system turns kitchen work into a height of pleasure. A modern convenience, like a warning drawer for warming up dishes or keeping food warm, should be convenient to use too. Mounted in the full-extension runner, the warming drawer pulls all the way out and glides back in again with cushioned closure. There's no wobbling about with the strong Quadro runner. Just ergonomic access, unobstructed vision and much more pleasure working in the kitchen.