Edit/View button of Lightmap Parameters is not functional and when clicked, it does not display (switch to) the custom lightmap parameters in inspector when inspector and lighting tab are in the same column.

Steps for reproduction:
1) Go to Lighting tab and find Lightmap Parameters in Global Illumination section.
2) Switch the "Scene Default Parameters" to another option or create a custom one.
3) Click on Edit (when a custom lightmap parameter is created) or View (when a preset is selected).
4) Observe the bug. Lightmap Parameter asset is not displayed in the inspector.

Notes:
- Introduced in 5.6.0b2 with new light modes (rev. 5d236ef0678a)
- Not reproducible in 5.6.0b1 and before