[Lazarus] Checkgroup behaviour

[Mark Morgan Lloyd]

I notice that if the CheckGroup Edit right-click is used to disable all 
lines, that right-click stops working so it is impossible to reenable 
any of them. Trunk r40343.

Also at runtime, the OnMouseUp event fires if the mouse is clicked over 
the group background, but not over one of the checkboxes or associated 
text. Similarly for the OnClick event- is this as it should be?

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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