The id of the linked tabpanel element that will be displayed when the tab is selected. If this attribute is not used, the tab will be connected to the panel at the corresponding index in the tabpanels element that the tab is in its tabs container. However, if this attribute is used, this behavior is overridden, and the tab will always be linked to a specific panel. This might be used to avoid duplication by linking several tabs to one panel with slight differences to the content adjusted in the select event.
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