sourcing functions in file with has gui_running from .vimrc

Currently running:

VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Sep 1 2012 18:08:47)
MacOS X (unix) version
Included patches: 1-646
Compiled by Bjorn Winckler <bjorn.winckler@gmail.com>

I have these lines in my .vimrc

if has("gui_macvim")
source ~/.vim/vimrc/mygfuncs.vim
endif

In the mygfuncs file are some functions that set the `guitablabel` and
`guitabtooltip` based on two custom functions. The file is being
sourced (because the functions are defined), but the lines that set
those variables using those functions aren't working:

set guitabtooltip=%{GuiTabToolTip()}
set guitablabel=%{GuiTabLabel()}

At this point, the variables are set properly, because if I

:set guitabtooltip

Vim responds with

guitabtooltip=%{GuiTabToolTip()}

But it isn't actually being applied.

**But** if I then `:so ~/.vimrc`, the tab label and tooltips *are* applied.

What is going on here?

c
--
Chris Lott <chris@chrislott.org>

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