Function openPanel

openPanel(layerId): void
JMap.Application.Layer.Edition.Thematic.openPanel

Opens the edition panel, with "thematics" tab activated, for the given layer
Parameters
- layerId: JId
  the JMap layer id
Returns void
Throws
if layer not found

Example
```
// opens the edition panel, with "thematics" tab activated, for layer id=3.
JMap.Application.Layer.Edition.Thematic.openPanel(3)
```