As Erel said :
My doubt is , all these 3 things are necessary or If I write AutoScaleAll in my designer script , it is enough . If there is a complete example for this , will help us more .The recommended way to adjust your UI is:
1. AutoScaleAll
2. Adjust the views location as required
3. Use SetLeftAndRight and SetTopAndBottom on the views that should fill the available space)