Custom Layout Issue.

We are creating a new custom layout to use in Area Management and we followed below link

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/804bedee-377e-2e10-0f83-d5b33c743dbc?overridelayout=true&51342039453959

, but the layout is not available  Area management page layouts. Can anyone suggest is there any other steps need to be config the layout so that layout will be available in Area Management page layout.