updating interact control

[Fred Gruber]

I would like to change the contents of a selector depending on other controls. For example,

    import numpy as np

    c = [1,2,3]

    @interact

    def _(a =selector(c),

          b = slider(5, 10, default=0):

          global c

         c=np.arange(0,b)

         print c

I would like the content of the selector 'a' to depend on what value b have.

Is there any way to update a control dynamically?

thanks

Fred