Add update services on theme activation

Themes don’t currently have activation/deactivation/installation/uninstallation hooks.

Your best bet is to “fake” it somehow, perhaps with a function that only executes one time, based on a switch that gets toggled when the function executes. e.g.:

<?php
function wpse45817_theme_activation() {
    // globalize our switch
    global $wpse45817_theme_activation_switch;
    // Check to see if the switch is set
    if ( isset( $wpse45817_theme_activation_switch ) ) {
        return;
    } else {
        // EXECUTE YOUR THEME-ACTIVATION CODE HERE
        //
        //
        // Toggle Theme activation switch
        $wpse45817_theme_activation_switch = true;
    }
}
add_action( 'after_setup_theme', 'wpse45817_theme_activation' );
?>