Difference between ticked and <not yet defined> YES/NO values, linked file

[KristianKvistgaard]

When tabbing your way to a element from a linked file, you aren't able to distinguish between YES/NO parameters value that are ticked On or not yet defined...

In the Example picture, a have selected a door from a linked model. It is only the FireExit parameter that are ticked on. All the others YES/NO parameters aren't either on or off (not yet defined)...

We NEED somehow be able to tell the difference...!

[dplumb_BWBR]

That whole Yes/No/Maybe concept needs to be reworked.

There should be some other indication (and valid value) for an undefined Yes/No other than greying it out.

We use 

Value does not equal No in a lot of our formulae to filter out values that are truly equal to Yes - as opposed to undefined.

IT works, but it really messes with your mind.