Impossible to view/hide sublayers checking/unchecking only the group layer checkbox

[GoogleCodeExporter]

What steps will reproduce the problem?
1. create a TOC tree with 3 or more unchecked and not visibile levels  (i.e. L1 
that contains L2 that contains the data-layer L3)
2. check the grand-father (L1) of the layer (L3) in order to make it visible
3.

What is the expected output? What do you see instead?
I expect that all the sublayers (L2 and L3) will be checked and visible but 
only L2 is checked and no data (L3) is displayed.
The same occurs for unchecking event.

What version of the product are you using? On what operating system?
I'm using version 2.03 

Please provide any additional information below.

Original issue reported on code.google.com by matteo.l...@gmail.com on 9 Jan 2013 at 2:49