stripchart in slave interp

[S.C.H]

I am unable to create a stripchart in a slave interp using Tcl 8.4.x on in Windows XP.
# this works in the main wish interp
    package require BLT
    set sc [blt::stripchart .sc]
    pack $sc

# this does not work
    set slv [interp create]
    $slv eval {package require BLT}
    $slv eval {blt::stripchart .sc} ;# <--- returns "invalid command name blt::stripchart"
    $slv eval {pack $sc}

Any reason this should not work?

[George A. Howlett]

By default, slave interps don't contain Tk commands.  The
"package require BLT" command is loading BLT commands that don't
require Tk.

set slv [interp create]
$slv eval {
    package require Tk
    package require BLT
    blt::stripchart .sc
    pack .sc
}