Gtk.Assistant.prototype.get_nth_page
function get_nth_page(page_num:Number):Gtk.Widget {
    // Gjs wrapper for gtk_assistant_get_nth_page()
}Returns the child widget contained in page number page_num.
Since 2.10
- page_num
- the index of a page in the assistant, or -1 to get the last page 
- Returns
- the child widget, or null if page_num is out of bounds