Preheat oven to 425. Line 15 1/2 by 10 1/2" jelly roll pan with parchment paper.
On lightly floured surface with floured rolling pin,roll dough to a 14x10" oval. Transfer to prepared pan and reshape. Cover with clean dishtowel and let stand 15 mins
In cup,mix olive oil and butter;brush over dough. Sprinkle dough with 2 Tbls sugar
Bake dough 10 mins. Remove from oven and top with blueberries and cherries;sprinkle with remaining sugar. Return focaccia to the oven;bake 10 to 15 mins longer or till fruit is juicy and dough is browned at edges.
Slide focaccia onto wire rack using parchment paper. Cool slightly to serve warm,or serve at room temperature. To serve,sprinkle focaccia lightly with confectioners' sugar