def zSel
	model = Sketchup.active_model
	sel = model.selection
	v = model.active_view
	if sel.empty?
		v.zoom_extents
		v.invalidate
  	else
		if Sketchup.active_model.rendering_options["InactiveHidden"] == true
			Sketchup.active_model.rendering_options["InactiveHidden"] = !Sketchup.active_model.rendering_options["InactiveHidden"]
			Sketchup.send_action("viewZoomToSelection:")
			Sketchup.active_model.rendering_options["InactiveHidden"] = !Sketchup.active_model.rendering_options["InactiveHidden"]
		else
			v.zoom(sel)
		v.invalidate
		end
	end	
end

if (not file_loaded?("zSel.rb"))
	UI.add_context_menu_handler do |menu|
		menu.add_item("Zoom on selected"){zSel}
    end
end
file_loaded("zSel.rb")