Headlight Switch problems of the 1999 Chevrolet Silverado

Vehicle is equipped with daytime running lamps. Headlights work off light sensor that automatically switches between day light running lights and head lights. No way to deactivate this feature. Once headlights come on with the "auto" feature, there is no way to shut them off without turning off ignition. Headlights go on/off during daytime if you are in shade of buildings or trees. Annoys other drivers who think you are "flashing" headlights at them. In addition, in some circumstances where you may need to turn off head lamps (at a boat ramp for example) to keep from bothering others, there is no way to shut off head lamps without turning off ignition.