Just reporting progress:
As soon you understand these nested palettes, PaletteRefUtils works neatly when the app is up and running.
I created an appropriate menu item down in Windows/Workspace to let the user reset my panels…
Hint: always check GetPaletteRefType(), e.g. NewFloatingTabGroupContainerPalette() yields a kTabPaneType.
My Initializer does not yet find the panel's PaletteRef - it is probably too early for panelMgr->GetPanelFromWidgetID().
There must be some other way, PanelMgr has them already registered via its own Initializer as I presumed.
I'll continue tomorrow.
