On pages without a specified width, where those pages do not extend beyond the width of the screen, WinPhone still allows those pages to swing side-to-size (as if they scrolled horizontally, even though there is no actual overflow to scroll). This is super annoying when trying to manipulate a control on the page, like sliding a toggle button side-to-side. The login sample app demonstrates this.
With the new WinPhone Universal client, this issue is no longer present (there is a very subtle side-to-side motion when dragging other than on a control, but it does not impact usability like before).
On pages without a specified width, where those pages do not extend beyond the width of the screen, WinPhone still allows those pages to swing side-to-size (as if they scrolled horizontally, even though there is no actual overflow to scroll). This is super annoying when trying to manipulate a control on the page, like sliding a toggle button side-to-side. The login sample app demonstrates this.