The passenger sign switches ("No Smoking" and "Seat belt") are "property-adjust" actions. Left mouse button is brighter. Middle mouse button (sometimes a mouse wheel) is dimmer.
Here is the xml doc with the switches.
https://github.com/tdammers/CRJ700-fami ... ppanel.xmlDidn't check the hydraulic yet.
Edit: My mice all have wheels as the middle button. Press the wheel as if it is a button.