How to display an error page in Joomla! raw component code

I need to display 404 and 403 error pages if some conditions are true in my component code. I'm using /index.php?option=com_live_editor&format=raw to c开发者_StackOverflow社区all a component. raiseError just shows me an output from component with no messages.

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Why are you using format=raw in your query string? Is this an Ajax call?

JError::raiseError(404, "Message");

is the appropriate way to show error pages in Joomla.