First of all I would like to apologize for not providing enough details in my previous reply. I hope that the information below will be of help for better understanding the purpose of the "Zone" flag:
There are 3 skins that set a background to the page when used - these are Forest
. There are scenarios however, where you would not want to have your page's background changed - that is where the Zone flag comes in help. When it is set for the ControlsToSkip property, it will force the decorator not to set background to the decorated zone - no matter if it is a specific zone declared with the DecorationZoneID or the whole page if no DecorationZoneID is set.
For convenience I attached to this thread a screenshot that shows how the page is affected in different setups.
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