<ig:xamTreemap.ValueMappers> <ig:DoubleMapper ValueTypeName="Manufacturer" ValuePath="Revenue" TargetProperty="FontSize" MappingMode="AllNodes" From="5" To="15" /> <ig:DoubleMapper ValueTypeName="Product" ValuePath="StandardCost" TargetProperty="BorderThickness" MappingMode="AllNodes" From="1" To="5" /> <ig:DoubleMapper ValueTypeName="InventoryEntry" ValuePath="Quantity" TargetProperty="CornerRadius" MappingMode="AllNodes" From="2" To="10" /> </ig:xamTreemap.ValueMappers>