Look, to do this, you can make something by yourself.. I don't think, to there is some automatic "share box window", plugin whatever.
Inside construct, create first your button, for example: "sharebox", somewhere in corner, center, any position you want.
Then create a "box window" (design it before) with all graphics+buttons, and put this at center for example..
Now, create your code for any buttons separately and when you press the "sharebox" button, the "box window" will open with all share buttons together, to press any button you want.
I think this is the conceivable way.
Cheers.. : -)