Hello!
Click on your text box and hit command-shift-i. Select "Size" from the popdown menu. At the bottom of the windw you will see a graphic that looks like a window with lines running through the horizontal and vertical centers. Click the horizontal line on the inside of the window graphic, you will see the lines inside the window curl (make sure this is the INSIDE of the window graphic and not the outside). Now repeat this step with the vertical line. Run your app and enjoy the results!
Have a great day!
Albert