2.change pcd adding rule to use existing item type and value for the same pcd entry. 3.focus on added modules in sorted display. 4.fix the bug of not editable value if change item type to fixed at build. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1326 6f19259b-4bc3-4df7-8a09-765794883524