Script Extensions and Scope

I don't think I'm configuring this correctly.  Here's my Description.xml:

<?xml version="1.0" encoding="UTF-8" ?>

<ScriptExtensionGroup Name = "Custom Functions">

    <ScriptExtension Name = "Global" Author = "Lance Behmer" Version = "1.0" Homepage = "www.flowcal.com">

        <Script Name="_global_methods.js">

            <RuntimeObject Name="global">

                <Method Name="run_app" Routine="run_app">

                    <Description>

                        Runs the desired app.  If not found, the script kicks out and writes to the log.

                    </Description>

                </Method>

                <Method Name="close_app" Routine="close_app">

                    <Description>

                        Generic method to close the specified application.

                    </Description>

                </Method>

                <Method Name = "excel_state" Routine = "excel_state">

                    <Description>

                        Generic method to open and close Excel.

                    </Description>

                </Method>

                <Description>Generic global class for methods used by all projects.</Description>

            </RuntimeObject>

        </Script>

    </ScriptExtension>

    <ScriptExtension Name = "Excel" Author = "Lance Behmer" Version = "1.0" Homepage = "www.flowcal.com">

        <Script Name="_excel.js" InitRoutine="Initialize" FinalRoutine="Kill">

            <RuntimeObject Name="Excel">

                <method Name="Workbooks" Routine="Workbooks">

                    Selects the spreadsheet file and workbook to use.

                </method>

                <Property Name="excel" GetRoutine="getExcel" SetRoutine"setExcel">

                    Holds the value of "Excel" for manipulation.

                </Property>

                <Description>Generic class for manipulating Excel.</Description>

            </RuntimeObject>

        </Script>

    </ScriptExtension>

    <Description>

        Global methods for use in all applications.

    </Description>

</ScriptExtensionGroup>



And here's the _excel.js contents:

//   Global variable to the class, not available to the main script.

var excel ;



function Initialize()

{

    //Log.Message("Initialization WORKS!") ;

    setExcel() ;

}



function Kill()

{

    excel.displayalerts = false ;

    excel.SaveWorkspace() ;

    excel.displayalerts = true ;

    excel.quit() ;

}



function getExcel()

{

    return excel ;

}



function setExcel()

{

    excel = Sys.OleObject("Excel.Application") ;

}



function Workbooks(path, worksheet)

{

    excel.Workbooks.Open(path).Worksheets(worksheet).Activate ;

}



/*

function Cells(row, column)

{

    excel.Cells(row,column) ;

}

*/



The contents of _global_methods.js file works fine until I add the new Runtime Object and then my "Global" Extension doesn't show up in the project.  Is there something I'm missing?