Bug 12884 find strings to externalize - should be cancelable
instead of a busy cursor it should show a progress dialog with cancelation
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/FindStringsToExternalizeAction.java
ICompilationUnit cu;
		int count;
		NonNLSElement(ICompilationUnit cu, int count){
			this.cu= cu;
			this.count= count;
		}
	}
	
	private static class ZeroStringsFilter extends ViewerFilter{
		public boolean select(Viewer viewer, Object parentElement, Object element) {
			return ((NonNLSElement)element).count != 0;
		}
	}
}