Hitting enter doesn't send text to LangeConsoleImpl

I'm implementing a Run Configuration for `iex`, the repl for Elixir, and I can get the process to launch, but I most be missing something in the other implementations: I can type at the prompt, but hitting Enter doesn't send the input to the iex process; it just gives me a new line for the same prompt.  I was basing my design off of intellij-erlang's and so I have a 

<actions>
    <action id="IEx.Execute" class="org.elixir_lang.console.Execute">
        <keyboard-shortcut first-keystroke="ENTER" keymap="$default"/>
    </action>
</actions>

to mimic intellij-erlang's

<actions>
    <action id="ErlangConsole.Execute" class="org.intellij.erlang.console.ErlangConsoleExecuteAction">
        <keyboard-shortcut first-keystroke="ENTER" keymap="$default"/>
    </action>
</actions>

But, I don't understand how that action is associated with console view in intellij-erlang or my own implementation.  Is the naming scheme important?  I feel I must be missing something that makes ENTER work in the console view or connects the action to the view.