The probem:
The error message which appears when hovering the exclamation mark when validating a form, is perfect when showed first. The second time the message is positioned incorrectely.

How to reproduce:
  1. Open: http://staging.sencha.com:8080/examp...e:formsexample
  2. Resize the window that it just fits the form (to simulate the form would be in the east panel / right aligned within the viewport)
  3. Create a validation error
  4. hover once - error is within the screen
  5. hover a second time - error is outside the screen