I am using overview sample in the code gallery: http://resources.esri.com/arcgisserver/apis/flex/index.cfm?fa=codeGalleryDetails&scriptID=15873 and able to put the oviewer map at lower right corner. I would like to click to show the overview map then click again to minimize it but I can't get the function to work. I used this also: SiteContainer.getInstance().mapManager.ovCan.visible = true or false.
Actually I think I need to change something on MapManager.mxml in order to show the full extent everytime and you helped me to customize the overview map to show on the buttom right hand corner.