Works fine here.
perl5.8.8 (build 817), Tk804.027, WinXP SP2.
UPDATE Sorry, didn't read text closely enough. Yeah, ugly bug here also if "Cancel" button is pressed. Sorry.
UPDATE
Ok, simple fix. Just make sure you don't try to assign "undef color", if user press cancel. Maybe add simple if test:
...
if ($colour) {
$colour_button->configure( -background => $colour, -activeback
+ground => $colour );
}
...
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