Function setLayerGroupExpansion

setLayerGroupExpansion(layerGroupId, isExpanded): void
JMap.Layer.setLayerGroupExpansion

Set the layer group expansion state.
Parameters
- layerGroupId: JId
  The JMap layer group id
- isExpanded: boolean
  if true will expand, if false will collapse the layer group
Returns void
Throws
Error if layer group is not found, or is not a layer group but a layer

Example
```
// Expand the layer group id -4
JMap.Layer.setLayerGroupExpansion(-4, true)
```