Sound Profile beginner question

I am looking to add sound to my gui buttons and I was looking into using the built in SFXProfile contained within GuiControlProfiles but I am having some issues.
I am having some trouble getting a GuiControlProfile's SFXProfile variable "mSoundButtonDown" to initialize and/or load anything. I currently create a new SFXProfile within the audioProfiles.cs file found in art/datablocks/ :

datablock SFXProfile(GuiButton_Snd)
{
   fileName = "MySound.ogg";
   description = "Audio2D";
   preload = true;
};

I then attempt to set mSoundButtonDown equal to my new Profile "GuiButton_Snd".

singleton GuiControlProfile( GuiCustomMenuButtonProfile :  GuiMenuButtonProfile)
{
   modal = true;
   soundButtonDown = GuiButton_Snd;
}

After starting up my application I get an error in the console window saying: Object 'GuiButton_Snd' is not a member of the 'SFXProfile' data block class.

I am wondering if there is something I am missing in creating my new SFXProfile?