flex textflow link processing

Question

Text Flow:

<TextFlow xmlns="http://ns.adobe.com/textLayout/2008"&gt;
  This os the Xml content to be displayed in my text flow. Added <a>link</a> for testing. I need to show a custom tool tip on click of the link.
  <img source="assets/images/0.jpg"/>
</TextFlow>

I am importing text xml in Text Flow using:

_textFlow = TextFilter.importToFlow(textInoput, TextFilter.TEXT_LAYOUT_FORMAT);

As mentioned above I have a text flow in which I am importing a xml also have link. I am getting the link and when I click on it ti opnes the project's directory. Instead of this I need to call a function to display a custom tool tip.