The buttons you show the Tooltip for are current
targets - you hover a button and it becomes target. These elements may not exist when the Tooltip is initialized and it will still be shown if you add them at a later point and hover them. They are specified through the filter option, e.g.,:
(of the elements passed to the filter option) is the one that has to exist when the Tooltip is initialized:
That is why it works in the example you have given: when the container is the parent Grid changes to elements within it (child grid, buttons) will not prevent the Tooltip from showing, as long as the container ("#parentGrid") is not destroyed.
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