Hi,
you should mention what kind of GUI you got. I assume it is either Tk or Gtk. If it's Tk I can't be of any help to you.

If it's Gtk you could just delete the text of the entry-widgets in the function which is connected to the save button.

Say you got:

# ... lots of stuff
$entry = new Gtk::Entry(8);
$button = new Gtk::Button("Save");
# pass the entry-varible to the sub, if it ain't global
$button->signal_connect( "clicked", \&savethings, $entry);

# ... lots of more stuff :-)
[download]

The the function savethings could be something like

sub savethings {
    # here we receive the entry-widget (and the save-button, too)
    my ($savebutton,$entry) = @_;
    # delete text in entry
    $entry->set_text("");
    # save things 
    # ...
}
[download]

Hope this helps.

Regards...

Stefan