Bug 81196 Can't search for References, ... to an ITypeParameter [search]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/FindWriteReferencesInWorkingSetAction.java
* @param site			the site providing context information for this action
	 * @param workingSets	the working sets to be used in the search
	 */
	public FindWriteReferencesInWorkingSetAction(IWorkbenchSite site, IWorkingSet[] workingSets) {
		super(site, workingSets, new Class[] {IField.class, ILocalVariable.class });
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_WRITE_REFERENCES_IN_WORKING_SET_ACTION);
	}
	/**
	 * Note: This constructor is for internal use only. Clients should not call this constructor.
	 */
	public FindWriteReferencesInWorkingSetAction(JavaEditor editor) {
		super(editor, SearchMessages.getString("Search.FindWriteReferencesInWorkingSetAction.label"), new Class[] {IField.class, ILocalVariable.class } ); 
		setToolTipText(SearchMessages.getString("Search.FindWriteReferencesInWorkingSetAction.tooltip")); 
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_WRITE_REFERENCES_IN_WORKING_SET_ACTION);
	}
	/**
	 * Note: This constructor is for internal use only. Clients should not call this constructor.
	 */
	public FindWriteReferencesInWorkingSetAction(JavaEditor editor, IWorkingSet[] workingSets) {
		super(editor, workingSets, new Class[] {IField.class, ILocalVariable.class });
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.FIND_WRITE_REFERENCES_IN_WORKING_SET_ACTION);
	}
	int getLimitTo() {
		return IJavaSearchConstants.WRITE_ACCESSES;
	}
	String getOperationUnavailableMessage() {
		return SearchMessages.getString("JavaElementAction.operationUnavailable.field"); 
	}
}