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There isn't a built-in function to do this. Some options:
1. since the groupTitle is allowed to be HTML, put HTML for a checkbox in it and add event handlers via GWT APIs for working directly with HTML elements (see also the DOM-level integration overview)
2. build your own subclass of Canvas that replicates the look you want via using CSS border and margin to render the outline, and placing a DynamicForm for the checkbox and title on top of the margin (which is roughly how the built-in isGroup feature is implemented, except with a simple Label instead of a DynamicForm).
3. use Feature Sponsorship to have this added as a core framework feature
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