Place a widget inside a control bar, grid, list or data view

Is it possible to add widget inside a control bar? I have created some widgets (dropbox), which I like to place in a data grid control bar, they act like a buttons. The data grid selection mechanism would be useful as an input of the widget. (I would be cumbersome to use a microflow) But it so far i can only place them in a data view. Would be nice to support such a feature.
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