Allow modules to act when an overlay child window is initialized.
The child window is initialized when a page is displayed from within the overlay, so modules can act here if they need to take action to work from within the confines of the overlay.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_overlay_child_initialize() {
// Add our custom JavaScript.
drupal_add_js(drupal_get_path('module', 'hook') . '/hook-overlay-child.js');
}