How to mark a field as completely hidden for smartgwt ListGrid?

Hi guys,

How to mark a field as completely hidden for smartgwt ListGrid?
I do listGridFields[i].setHidden(true) according to API,But it still
could be able to show the field via a context menu.
and the API said 'canPickFields' has been set false can solve this
problem,but where the canPickFields ?

Thank you

Best Regards
Daniel

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