invalid command name "button"
    while executing
"button .b1 -text "Eukaryota" -command [list ChC .b1] -font "Helvetica 16""
    (in namespace eval "::request" script line 9)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
#!/usr/local/bin/wish

proc ChC w {
set c [tk_chooseColor]
$w configure -bg $c
return
}

button .b1 -text "Eukaryota" -command [list ChC .b1] -font "Helvetica 16"
button .b2 -text "Prokaryota" -command [list ChC .b2] -font "Helvetica 16"
button .b3 -text " Archaea " -command [list ChC .b3] -font "Helvetica 16"
pack .b1 .b2 .b3 -side left