Showing multiple layers using one checkbox

[Bradley Mclain]

Ok I currently have a mapfile which has multiple layers which make up my 
image. I have set it up so that you can use a checkbox to turn these on and 
off. What I want to do however is combine two of them into the one checkbox.

E.g. Currently I have two different shapefiles making up a boundary for a  
property. They are defined in seperate layers in the mapfile. I want them to 
both display when I tick a "Property Boundary" checkbox.

Brad

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