sets an external instance which controls the value of the component
Any previously active binding will be revoked. There can be only one!
Parameter aBinding
the new binding which is to be used by the component. May be NULL,
in this case only the current binding is revoked.
Throws
IncompatibleTypesException
if the new binding (provided it's not NULL) supports only types
which are incompatible with the types of the bindable component.
