Sets the page forwarding function to be page_func.
This function will be used to determine what will be
the next page when the user presses the forward button.
Setting page_func to NULL will make the assistant to
use the default forward function, which just goes to the
next visible page.
Since 2.10
Sets the page forwarding function to be page_func. This function will be used to determine what will be the next page when the user presses the forward button. Setting page_func to NULL will make the assistant to use the default forward function, which just goes to the next visible page. Since 2.10