Hello, just to add to Traddles, when the pointer is over either the slider, or the 'up' & 'down' buttons, the respective functions will happen, but only if the pointer brings up a white dot; ie., slide the right ramp by holding LMB (left mouse button) down as you slide the toggle. When it is down, move the pointer to the blue button & hold the LMB while the roller door goes up. The reverse order is the yellow button to lower, then slide the toggle up. If the dot under the pointer is red, then you are restricted from using that function.
Kind regards,
Oiler