BuddyPress.org

I want to show only images post when user click on ‘Chart’ Tab at Activity page.
I add some code but it not working through ajax, it showing when page reload.

function my_theme_add_activity_tab() {
if ( !is_user_logged_in() )
return false;
?>

<li id="activity-myclass">

<a>" title="<?php _e( 'Activity for my Class Year.', 'buddypress' ) ?>">

<?php printf( __( 'Chart', 'buddypress' ) ) ?>

</a>

</li>

<?php

}

add_action( 'bp_activity_type_tabs', 'my_theme_add_activity_tab' ); 

Please help me.