ToolTip control is present in the Windows Phone FCL, yet it serves no real purpose because it is a control designed to work with a pointing device, such as a mouse, and relies on hovering the mouse over the control. Hover events, which ordinarily dictate when a
ToolTip is displayed, do not exist in the realm of the phone, making the
ToolTip redundant unless used in an unorthodox way.
Perhaps future displays will have the capability to sense finger display proximity. Then, no doubt, the
ToolTip will make it to the Windows Phone platform.