TIWFilePicker width with mozilla firefox

Hello guys,

I have a problem with this component. I can't to modify width when I run my applicattion with firefox, IE run ok.
Always it  has the same width. Someone tell me than I can do?

The TTIWFilePicker is only included in the TMS IntraWeb Component Pack for compatibility with older versions. Please use the default IntraWeb TIWFile control instead.