Bug 9103 Search reports no references to SWT.Help
1) Open class SWT 2) Select field Help 3) References>Workspace Nothing found
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaElementAction.java
}
	public boolean canOperateOn(IStructuredSelection sel) {
		boolean hasSelection= !sel.isEmpty();
		if (!hasSelection || fValidTypes == null)
			return hasSelection;
		if (fValidTypes.length == 0)
			return false;
		IJavaElement element= getJavaElement(sel, true);
		if (element != null) {
			for (int i= 0; i < fValidTypes.length; i++) {
				if (fValidTypes[i].isInstance(element))
					return true;
			}
		}
		return false;
	}
	public void run() {
		if (!canOperateOn(getSelection())) {
			beep();
			return;
		}
		
		IJavaElement element= getJavaElement(getSelection(), false);
		if (element == null) {
			beep();
			return;
		} 
		else if (element == RETURN_WITHOUT_BEEP)
			return;