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If you group some shapes, the GroupShape gets assigned the currently active layer.
However, the elements of the group still remember their original layer, and keep it when the group is ungrouped again.
If the group gets assigned explicitly to a layer, this layer is also assigned recursively to its elements.
This is reported as the result of some experiments.
I don't know a specification how the results should be.
Strange: TextBox can't be renamed via its context menu.
It can via the navigator. Intentional???