Hide New button in lookup dialog in Dynamic CRM

Dear all,

I've a lookup field A on form. And when click on lookup field A -> a pop-up lookup displayed.

So how I can hide/disable New button on lookup pup-up.

Now i've use lookupcontrol._behaviors[0].AddParam("ShowNewButton", "0"); -> and its work.

But .AddParam not work on Chrome and Firefox. So another way to hide this button not using .AddParam?

Thanks,

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