Just yesterday we received the same feature request and this idea is logged in the PITS in this URL
. There are already many plans for the Q2 2012 release and I cannot guarantee it will make it, but you can vote for the item if you want to increase its priority.
Currently an external button cannot be added to the RadSocialShare and I would recommend that you add it next to our control, you could additionally remove the border from the RadSocialShare (and add it to a common wrapper, for example) in order to make it look more uniform.
All the best,
the Telerik team
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