When using the fill command, there is no way to pick the color of the glass being filled with the command.

Setup: Enter in the command: /fill ~~~ ~~~ glass # (where # is the data value that selects the color of the glass)

Expectation: What this should do is fill the block exactly where you are standing with a block of glass that is the color you selected (e.g. black if you put in the "#" as "15")

What Happens: The glass that is filled is plain clear glass no matter what number you put into the command.