Valor de mudança multisselect de bootstrap

// select an option
$('#demo').multiselect('select', value);

// deselect an option
$('#demo').multiselect('deselect', value);

// select all options
$('#demo').multiselect('selectAll', justVisible);

// deselect all options
$('#demo').multiselect('deselectAll', justVisible);
TomatenTim