@Override
            public ImplementAs fromString(String string) {
                if (string == null) return null;
                else return ImplementAs.valueOf(string);
            }
Returns a property of the current implementation used by this column.
<p>
<em>Warning!</em> The returned object can be both read and written to,
but note that it may be garbage collected unless the caller saves a
reference to it somewhere.

@return  a property of the nullable implementation.
tool-parent/tool-config/src/main/java/com/speedment/tool/config/trait/HasNullableProperty.java