UiBinder custom panel

Hi, all,

is it possible to create a custom panel, and use it just like the
usage of <g:west>:

<my:MyPanel>
<my:colomn_1>
<g:Button/>
</my:colomn_1>
<my:colomn_2>
<g:Button/>
</my:colomn_2>
</my:MyPanel>

where <my:colomn_1> is encountered , i want GWT to call
myPanel.addWidgetToColomn( Widget w, int i) method.

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