    deferred class
    	EV_TAB_CONTROLABLE

    General
    	cluster: interface
    	description: "Abstraction for objects that may have their ability to be tabbed to enabled/disabled."
    	keywords: "select, selected, selectable"

    Ancestors
    	EV_ANY*

    Queries
    	data: ANY
    	is_destroyed: BOOLEAN
    	is_tabable_from: BOOLEAN
    	is_tabable_to: BOOLEAN

    Commands
    	copy (other: [like Current] EV_TAB_CONTROLABLE)
    	destroy
    	disable_tabable_from
    	disable_tabable_to
    	enable_tabable_from
    	enable_tabable_to
    	set_data (some_data: [like data] ANY)