Fix the height and width of your icon in the image tag(based on your icon dimensions) as your icon is same for all rows and also set maintainAscpectRatio="false".
<mx:Image width="25" height="25" maintainAscpectRatio="false"/>
Still its not working. It seems like that the image is bulgded and the size is increased.
by default, the itemrenderer tries to span the available cell width. try putting the image in a container.
<mx:HBox verticalAlign="middle" horizontalAlign="center">
<mx:Image verticalAlign="middle" horizontalAlign="center"/>
Can you post the code of your Image itemRenderer ..??
Its working fine. Thanks for your reply.
Thanks & Regards,