1. Press Greek seasoning into both sides of steak. Place steak in large food storage bag. Seal bag; turn to coat. Marinate in refrigerator 30 to 60 minutes.
2. Prepare grill for direct cooking.
3. Place steak on grid over medium-high heat. Grill, covered, 17 to 21 minutes or until desired doneness, turning once. Transfer steak to cutting board; let stand, covered with tented foil, 10 minutes before slicing.
4. Meanwhile, grill pitas about 1 minute on both sides or until warm. Slice steak across the grain into thin strips; evenly divide meat among pitas. Top each with onion, cucumber, tomato and feta cheese. Drizzle 1-1/2 teaspoons vinaigrette over each pita. Top with 1 to 2 tablespoons yogurt.
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