True if the action is currently enabled. False otherwise.
Invokes this OperationBinding, for example, as a result of a UI button being pressed.
This should translate into invoking some operation on the underlying data control.
If there are exceptions within the invoke operation, these exceptions should be
accessible via getErrors().
Returns a list of errors that were raised during the last invoke operation
Returns the result of invoking the operation bound by this binding (if the method
has been already invoked. This method may not force the method invocation.)
This method may return null in case the method has not been invoked.