can't read "dir": no such variable
    while executing
"file join $dir combobox.tcl"
    (in namespace eval "::request" script line 3)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
package ifneeded combobox 2.3 \
    [list source [file join $dir combobox.tcl]]