When using fixedHeader, ensure that the horizontal scrollbar is visible.
Merge pull request #227 from PrimeRevenue/bug/fixed_horizontal_scrolling

When using fixedHeader, ensure that the horizontal scrollbar is visible.
Fix for grid internal scrolling
Updated message panel for single message issue
Merge branch 'bug/issue_with_long_text_error_messages' of https://github.com/PrimeRevenue/tent into bug/issue_with_long_text_error_messages