ExternalGoods.HintBox.WP (nuget): Free, simple & easy to use TextBox-based component for Windows Phone 8 (and higher) providing support for hints.   Hint string is displayed only when the control is "empty" (no text is provided by user). The hint does not affect the control value - requesting text when hint is displayed will return empty string.  See Project Site for a quick reference on using this component in your projects.
Keywords: windows-phone|wp|hint