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.
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.