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query.Query creates a popup with entry and ok/cancel buttons, in that order. Tabbing moves from the entry in that order. Currently, subclasses that add widgets add them after the 3 above, so they follow Cancel in the tab order. They do this by overriding create_widgets and initially calling super.create_widgets.
Added widgets should follow the entry box and precede the exit buttons. To do this, they should be created in between. Proposed solution: create_widgets calls 'extra_widgets' (pass for Query) after creating the Entry. Subclasses override to add widgets.