How to create an editable List box

Hi,
Can any body help me out in creating an editable list box, I mean the options should be editable in the listbox. Thanks in advance.

I mean, you have dropdown list box with some options.
They will not be editable in the normal scenario. I want one of the options to be editable, similar to a textbox , when selected.
Is that possible in JSF? If any one could help with Javascript also, its fine for me.

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