How to change Enum possible values
<p>The following code does not work:</p>

<pre><code>from traits.api import HasTraits,  Enum

class A(HasTraits):

    enum = Enum(1,2,3)

class B(A):

    def __init__(self):
        self.trait('enum').default_value = ['one','two','three']

b = B()
b.configure_traits()
</code></pre>

<p>Instead of having the choice ['one','two','three'] in the drop-down list, it is still [1,2,3]. Is there a way to modify an Enum content in any way after it has been declared once?</p>