dgText [true] question?

[Jim Lambert]

This script from tutorial "3389-How-Do-I-Populate-a-Data-Grid-With- 
Data-" just doesn't work for me.
	answer file "Select iTunes text file:"
	put it into theFile
	put true into firstLineContainsHeaders
	set the dgText [firstLineContainsHeaders] of group "DataGrid 1" to  
URL ("file:" & it)

The grid remains empty, no column headers, nada.

	set the dgText [FALSE] of group "DataGrid 1" to URL ("file:" & it)

puts the file into the grid but with the header line in row 1 and the  
columns labelled "Col 1", etc.

This does work:

    answer file "Pick a file:"
    if it = "" then exit mouseup
    set cursor to busy
    put it into cFile
    put the hilite of btn "Header?" into hasHeader    -- I use a  
checkbox to indicate there's a header.
    put  url ("file:" & it) into tempData
-- now parse the header line and prepare it for dgProp
    put line 1 of tempData into cols
    replace tab with cr in cols

-- kill the header row
    delete line 1 of tempdata

-- set the column names manually
    set the dgProp["columns"] of grp "datagrid 1" to cols

-- now set the grid text with as if there is no header.
    set the dgText [FALSE] of grp "datagrid 1" to tempdata

I thought the whole idea of 'pFirstLineContainsHeaders' was to handle  
the header row automatically.
What am I missing?

Thanks,
Jim Lambert