I've got a problem when using Shoes. I'm basically trying to open an excel document and pass the names of the worksheets to a list_box. The following method is called on a button press after selecting a file. (This all works and the file opens)

exc = WIN32OLE::new('excel.Application')
excWB = exc.Workbooks.Open(xlsFile)
@excWS = Array::new
exc.visible = true
excWB.Worksheets.each { |ws| @excWS.push(ws.name) }
para @excWS
list_box :items=> @excWS  

Not only do the names not show up in the list_box, the app crashes shortly after loading the box with no error. para @excWS shows the names of the worksheets with no problem.

What am I doing wrong?