Why dont you extend the GWT classes and give them your desired default 
values? E.g. instead of HorizontalPanel you would create a 
"CenteredContentPanel" that extends HorizontalPanel and sets its own size 
to 100% along with the desired alignment?

Alternatively you can also look at @UiChild for custom widgets if you want 
to define some "slots" in your custom widget that you want to fill using 
UiBinder tags. Using @UiChild you could do something like

<my:CustomWidget>
  <my:leftalignend>
    <g:FlowPanel /> 
  </my:leftaligned>
</my:CustomWidget>

class CustomWidget .. {
  @UiChild
  public void addLeftAligned(Widget w) {
    leftAlignedContainer.add(w);
  }
  ......
}

http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/uibinder/client/UiChild.html

Or as already mentioned, create some common CSS and apply the CSS class to 
the HorizontalPanel.

-- J.

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