Post #2809: ?
Yes, use 1 button in the topbar with this code (Custom tab):
Blender 2.8+:
draw_menu(C.workspace.name) or draw_menu("Default Topbar")
Blender 2.7:
draw_menu(C.screen.name) or draw_menu("Default Topbar")
And add new popup dialogs with tab names (Layout, Sculpting, Shading…) and Default Topbar popup dialog for other tabs.
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