Biju,
1) To disable validation, you should be able to go to Project Properties > MyEclipse > Validation > Excluded Resources and check the tree you wish to exclude.
2) You can globally disable the facelets validator from Window > Preferences > MyEclipse > Validation. Uncheck both the boxes for ‘Facelets Validator’. This will trigger a full project rebuild, after which, facelet validation will be globally disabled.
Let us know how it works for you.