The UML modeler is built on top of the Domain-Specific Language (DSL) Toolkit, so you'll need to download and install the Visual Studio 2010 SDK and the Visual Studio 2010 Visualization and Modeling ...

There's a Location textbox there and in it you'll see the file path to the file that holds the code snippet. Copy that file path (sadly, Ctrl_A won't work but clicking at the start of the path and ...