Tries to configure a Proxy object for use in an Authenticator if there is a
proxy defined by the properties http.proxyHost and http.proxyPort, and if
the user has set values for the properties (note, these are not standard
java properties) http.proxyUser and http.proxyPassword.
Constructs a default FormConstraint which positions the
component over both columns and aligns the component
horizontally to the LEFT and vertically at the CENTER.
Constructs a default FormConstraint which aligns the
component horizontally to the LEFT and vertically at
the CENTER and positions the component at the position
supplied.