Autocad Dynamic Block Double Visibility Lookup Garry Batt

Ok, a bit of a work around but this came up as an issue in the office. How to create a double lookup for visibility states in a dynamic block. This shows how I created a double lookup for some standard window types that we use on a daily basis. Hope you enjoy and please let me know your comments. Cheers, Garry
Update: (10:14) There is a glitch we have found where the double lookup parameter set doesn't appear. You need to change the variable BACTIONBARMODE to 0. You can only do this whilst editing the block. Hope that helps.