The amount by which the field is incremented or decremented each time the spinner is tapped.
Defaults to undefined, which means that the field goes up or down by 1 each time the spinner is tapped
The type attribute for input fields -- e.g. radio, text, password, file (defaults
to 'text'). The types 'file' and 'password' must be used to render those field types currently -- there are
no separate Ext components for those.