title: Flex: how to control Spark datagrid header-text alignment?
body: <p>If I have 10 columns in a Spark datagrid, and some headers need to be left-justified, some headers right-justified, and some centered, what's the simplest way to accomplish this? </p>
  
  <p>Assuming a custom headerRenderer is needed, are there any simple examples that can walk me through it? </p>
  
  <p>Thanks in advance for any comments.</p>