The suffix Base is deliberately not used, because almost each class in PMF is represents some sort of general interface and meant to be subclassable, and adding Base would make long class names even longer.
The naming convention for concrete subclasses are as follows.
The base-classes:
wxPM<InterfaceName>Their derivatives:
wxPM<concrete-name><InterfaceName>For example, base: wxPMWorkplace, derived: wxPMMyWorkplace, or base: wxPMBrowserPane, derived: wxPMFileBrowserPane.