Hate to contradict Virtuali, but here goes. Go to Page 50 of this forum, scroll down to No. 7 Post (last one), and follow Link. Scroll down about 10 Posts until you find LPMA_CVX.bgl. Download that file.
Now, make a new folder called, say MaderiaX GSX, and inside that make another folder called scenery. Place the downloaded file inside the scenery folder.
Place the MaderiaX GSX Folder in FSX/Addon Scenery, then activate in scenery library. I am assuming you are using Aerosofts MaderiaX; if you are make sure your Folder MaderiaX GSX is in a higher position than your Aerosofts MaderiaX.
Any problems revisit here/