Fills and Constraints

[Anonymous]

So first off, thank you to those who helped out with my last question. The prompt response was very helpful and much appreciated.

So I'm working on modifying and downloading emergency lighting fixtures to use in revit and have come across two things that I find interesting and don't understand but am hoping to use for our fixtures.

1) The first is a emergency light I downloaded from RevitCity user ArkieGrove and it uses checkbox constraints to change the visibility of fill regions. How he's doing that is utterly baffling to me and I would appreciate it if someone can help explain how to do this.

2) Just the typical Revit EM light. My initial understanding of fill regions in families is that if you wanted to use a fill region in a model family, you had to create the fill region in an annotation family first and then reference that annotation family to your model family. The only problem I've had with that is that the annotation family doesn't have a locked scale, so it becomes tiny at 1/4 scale and huge at 1/16 scale. However, this doesn't seem to be the case with Revit's EM lights and I can't find an explanation as to why.

Additionally, I was wondering if it was possible to combine these two properties. Ideally, I'd like to have a 2x4 troffer that has a checkable box to make it an emergency light. 

I'm including each of the files below, although I'll ask for you to download Arkie's file from RevitCity if you decide to use so that he gets credit for his good work. Thanks in advance for the help!

[kadmonkee · Accepted solution]

this family is built using detail Items as nested families and a combination of Types with dimension constraints and graphic symbols.

open this up and research how it was put together

light fixtures are not annotative as they take up physical space

receptacles on the other hand are Annotative and use a generic annotative symbolic family to display the various types of receptacles

see attached examples