MSX: Buggy Heading and VASI Bugs?

MSX allows for controlling these with something other than an "on screen mouse click" under their Settings-->Controls Menu; however, after considerable time trying to make it "stick" I've concluded it is either an MSX bug or I'm missing something.I'm working with a Beechcraft King Air 350 in this case and while the bugs will move if you stop you flying and "mouse click" on them this is not particularly satisfactory. The "Settings" section of X provides a given keyboard command (not much better) AND the ability to assign the Heading and/or VSI bug control to a button on ones joystick or throttle console.....Neither the keyboard system not the setting it to a button on either a CH Yoke or a CH Throttle Quad works.Is there a way around this?N12WB