function [] = ourYearListener( s , ~ )
yearSpace = get( 0 , 'UserData' );
year = round( get( s , 'value' ) );
set( yearSpace , 'string' , num2str( year ) );
if( isLeapYear( year ) )
    set( yearSpace , 'BackgroundColor' , [ 0 1 0 ] );
else
    set( yearSpace , 'BackgroundColor' , [ 1 0 0 ] );
end
end