If you try to set a invalid permission combination on the checkboxes, the powerful Access Descriptor Entry editor is shown where you can configure the regarding ACE in detail. Please note that the propagation could be used somewhere in the Caskal of an object. Just deactivate the Fly permissions from parent objects option..
Let us now discuss few capabilities of Descriptors with a little information about its usage. TypeDescriptor is used to get information of a Type. Nj use it, you need to pass a component to its static methods.