sending Polymorphic types from Server to GWT client

I have three objects, that implement a base interface and reside on
the server.

interface Base
class Foo implements Base
class Bar implements Base
class Baz implements Base

I want to send them over the wire to GWT client.

would GWT recognize the relationship they had ?

I want to use them in CellTree: NodeInfo
and would like to do something like

if (value instance of Foo)
///

if(value instance of Bar)
///

if(value instance of Baz)
///

is this possible ?
how ?

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