It's been a while since I've messed with WATasks, but I think you simply #call: it. Just keep in mind that you must include the components you're calling within children and that you're not calling from a render method.
If that doesn't help, someone who knows what they're talking about it bound to reply sooner or later ;)
RS
> Date: Wed, 23 Feb 2011 13:02:34 +0100
> From:
[hidden email]> To:
[hidden email]> Subject: [Seaside] Call a task from a task
>
> Hello everyone,
>
> i have small problem. I started to write an application with a rootTask
> and two subTasks. Now my problem is, how can i call from the rootTask -
> go method, a subtask?
>
> Thank you for your help.
>
> Kind regards
>
> Malte
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