This is a comma-delimited list of system Resources and associated
permissions. A user must hold the specified permissions on at least
one of the specified resources in order to view this page or
invoke any of its server-side methods from the client.
The format of each item in the list should be as follows:
Resource[:Permission]
Permission is optional, and defaults to USE if not supplied. If it
is supplied, it should be one of USE, READ or WRITE.
This callback is called after the server-side page
object and all of its children are created.
Subclasses can override this to add, remove, or modify
items within the page object model, or to provide values
for controls.