Heat butter and olive oil in a large nonstick skillet over medium heat.
Sprinkle flour over shrimp, tossing to coat well.
Add shrimp to skillet; cook, stirring constantly, 4 minutes or until shrimp turn pink and are lightly browned.
Remove shrimp from skillet; set aside, and keep warm.
Add garlic and rosemary to skillet; cook 1 minute.
Add wine, lemon juice, and tomatoes. Increase heat to high, and cook 7 minutes or until most of liquid evaporates. Return shrimp to skillet; cook just until heated.