Description
Filter the default form page that should be rendered.
Usage
Apply to all forms.
add_filter( 'gpmpn_default_page', 'my_custom_function' );
Apply to specific form.
add_filter( 'gpmpn_default_page_{FORMID}', 'my_custom_function' );
Since
This filter is available since GP Multi-page Navigation 1.0.1.