MOSYNC-3128: setting the title of a screen after it has been added as a tab screen child now looks if the parent is a tab screen and if so, searches for the screen and updates its title; I modified the TabScreenTest program: the second screen title is now set after the screen has been added to the tab screen
Merge pull request #423 from spiridon-alexandru/master

MOSYNC-3128
Merge branch 'master' of https://github.com/MoSync/MoSync into MoSyncLib