Place all the chocolates and butter in a microwaveable bowl. Microwave for 1 minute. Stir. Then microwave for 30 seconds at a time, stirring rapidly in between until thoroughly melted. Be careful! It can burn easily.
As an alternative: Melt the chocolates and the butter in a double boiler, stirring frequently until melted. Remove from heat.
Stir in vanilla. coconut and nuts.
Pour into a buttered 7" x 9" pan.
Refrigerate to set. When set, dump the chocolate out of the pan and cut into 2" squares (See note on how to do this easily.)
Notes
NOTE: You will need to refrigerate the candy for about an hour to set it. To release it from the pan and cut it into squares, put the pan in a pan of warm water to melt the chocolate a bit (don't let it overflow into the candy). Then tip it over onto a cutting board, and it will come right out of the pan.