my $button_update = $update->Button(-text    => 'Update suchen', -relief => "raised",
                           -command =>
                             sub 	{ 	
									$listbox->addOptions("0.9.2","0.9.3","0.9.4");
									$button_update->configure(-text => "Installieren");
									},
                        )->place( -x => 22, -y => 71, -width => 251, -height => 44);