Angular VectorMap - legends.source
Specifies the source of data for the legend.
grouping
Specifies the type of the legend grouping.
The VectorMap's legend supports two grouping types.
- color 
 Can be used if you have grouped map markers or areas in several differently-colored groups. For more information, refer to the layers's colorGroupingField and colorGroups property descriptions.
- size 
 Available for markers of a bubble type only. Can be used if you have grouped bubble markers in several groups and specified a size for bubbles in each group. For more information, refer to the sizeGroupingField and sizeGroups property descriptions.
layer
Specifies a layer to which the legend belongs.
Pass a layer name to this property.
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