filter - can't get apply_filter to work in wordpress thematic -

i learninig create templates in wordpress using thematic framework

in header file find:

 // filter provided altering output of header opening element     echo ( apply_filters( 'thematic_open_header',  '<div id="header">' ) );     // action hook creating theme header    thematic_header();      echo ( apply_filters( 'thematic_close_header', '</div><!-- #header-->' ) ); 

i want add wrapper div element around div id="header".../div created above

i have tried edit apply_filter lines this:

echo ( apply_filters( 'thematic_open_header',  '<div id="headerwrapper"><div id="header">' ) ); 

but doesn't work, printout out div id="header"

how can create html want to?

thanks

filters used in functions.php or in plugin this:

add_filter( 'thematic_open_header', function(){     return '<div id="headerwrapper"><div id="header">'; }); 

the basic difference between apply_filters , do_action first filters value , returns something, while add_action used want parameters sent or output browser.

some articles of interest: [1], [2], [3] , [4].