[Seaside] Get the html created by a render method to use as a string in another method

[Lukas Renggli]

> When I try the example below using WARenderCanvas #builder as you mention
> the label is not placed in the tab.
>
> renderContentOn: html
>        | testTab b |
>        b:= WARenderCanvas builder
>                render:
>                        [ html render: 'hello'.

- html refers to the renderer outside the block.

- WARenderCanvas builder creates a new renderer instance, this is the
argument passed into the renderer block.

Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch