You have a typo in a hash key (Localgroup_list instead of localgroup_list): 
$tk{localgroup_list}->DropSite(
    -droptypes   => [qw/Local/],
    -dropcommand => [ \&DropGlobalGroup, $tk{Localgroup_list}, $dnd_to
+ken2 ],
);

[download]
Should be: 
$tk{localgroup_list}->DropSite(
    -droptypes   => [qw/Local/],
    -dropcommand => [ \&DropGlobalGroup, $tk{localgroup_list}, $dnd_to
+ken2 ],
);

[download]
(This was the 3rd line from the bottom in your source, reformatted for easier reading)

-- grummerX

In reply to Re: Tk Drag&Drop Problem. by grummerX
in thread Tk Drag&Drop Problem. by blackadder

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