[Tapestry Wiki] Update of "Tapestry5HowToStreamAnExistingBinaryFile" by thobson

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The following page has been changed by thobson:
http://wiki.apache.org/tapestry/Tapestry5HowToStreamAnExistingBinaryFile

The comment on the change is:
Added a note about calling the event handler from an expansion

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  }
  }}}
  
+ === Calling the event handler from a page template ===
+ 
+ The event handler can be called using an actionLink e.g. <t:actionLink id="streamPDF">download pdf</t:actionlink> but the event handler can can also be called from an expansion, for example if you want to embed a dynamically generated/retrievd image in a page - ${embedImage()}. When the page renders the event handler will be called
+ 

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