http://cs.vbcity.com/blogs/xtab/archive/2009/07/01/wpf-and-winforms-interop-a-highlighted-textbox.aspxIntroduction A recent forum post on VBCity asked for a way to highlight an important TextBox in a Windows Form. Assuming that the plan is to highlight the TextBox if the user is about to leave the Form without entering any text into it, there are of courseenCommunityServer 2008 (Build: 30417.1769)