Switches the page to page_num.
Note that this will only be necessary in custom buttons,
as the assistant flow can be set with
gtk_assistant_set_forward_page_func().
Since 2.10
index of the page to switch to, starting from 0.
If negative, the last page will be used. If greater
than the number of pages in the assistant, nothing
will be done.
Switches the page to page_num. Note that this will only be necessary in custom buttons, as the assistant flow can be set with gtk_assistant_set_forward_page_func(). Since 2.10