[Seaside] date picker

[Pavel Krivanek]

> 1) I have tried to create subclass that submits parent form 
> immediately (ShoreDatePickerSubmitting). The problem is how to get ID 
> of parent form. I have solved this by adding next method to the 
> ShoreRenderer:

The second version is:

formId

    ^ (self callbacks instVarNamed: #owner) formId

This one works better with live actions. The instance variable #owner in 
WACallbackRegistry doesn't have accessing method.

-- Pavel