The CustomProperties interface describes the interface to an MBean
that allows the set of properties to be modified by adding/removing
additional properties.
If the Title or Breadcrumb for an MBean (defined in the resource bundle)
contains the placeholder string ${name} then the JSP will call this method
on the MBean for the display name to substitute for the placeholder.
If the Title or Breadcrumb for an MBean (defined in the resource bundle)
contains the placeholder string ${name} then the JSP will call this method
on the MBean for the display name to substitute for the placeholder.