DIsplay image in dynamic textbox

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Flash

I need to display image in dynamic textbox. I am going to use single textbox to display text and also image in button click event. Can any 1 tell how can i display image in dynamix textbox at runtime. Is there any possibilities.

I have done this
boxs.d4.htmlText = <img src='aaa.jpg' alt='image' align="middle" width="200" height="150"/>;
but i doesnot display image

Thanks