Did you open the r_triode.sym file and edit the attributes?Wookie, your triode example works for me, but I can't figure out how to do the same thing with a different symbol and .lib file.
You'll see Rydel_triodes.lib on the last line of the attributes panel.
It might be easier to put the library name in the SpiceModel field, and type in a default .subckt name that exists in the library into the Value field.
If the text you put in the Value field doesn't correspond to an existing .subckt in the .lib or .sub file, you won't get the scrolling list.
I started using the SpiceModle field for everything because I got tired of cluttering up my schematics with .lib statements, and it was annoying when a simulation would blow up because I forgot to include it.