WordPress at a glance
action is not described

install_themes_pre_(tab) action-hook . WP 2.8.0

Fires before each of the tabs are rendered on the Install Themes page.

The dynamic portion of the hook name, $tab, refers to the current theme installation tab. Possible values are 'dashboard', 'search', 'upload', 'featured', 'new', or 'updated'.

Usage

add_action( 'install_themes_pre_(tab)', 'action_function_name_9427' );
function action_function_name_9427(){
	// action...
}

Where the hook is called

In file: /wp-admin/theme-install.php
install_themes_pre_(tab)
wp-admin/theme-install.php 85
do_action( "install_themes_pre_{$tab}" );

Where the hook is used (in WP core)

wp-admin/includes/admin-filters.php 109
add_action( 'install_themes_pre_theme-information', 'install_theme_information' );