GitLab

It is often the case that people will want to construct a list of
components or store some information about a copmonent so that it can
be restored later. this currently requires putting all of the
initialization into the Screen's Initialize event handler. However,
many people intuitively expect that they can construct a list of
components as part of the global declaration. This changes allows for
component blocks and property getters to be used in a blocks tree with
a global declaration root node.

Change-Id: I69d26716ebf4bfcdd52465f15eaf75af1c4170cf