On 20 Mar 2014, at 18:13, Yuriy Tymchuk <yuriy.tymc...@me.com> wrote:

> Should this be an extension of List with buttons, of a buttons widget that 
> has a setters for the list to modify and the block for retrieving the rest of 
> items (during the addition action)

Sorry I do not understand your question :)
But I think the answer is
Make a complete new widget, with one list and two buttons, and enough methods 
to tweak the buttons and the list :)

You could even have a dedicated widget for the buttons, so one can replace them 
with a special new “buttons toolbar” widget

Hope it helps,
Ben

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