Converters in WPF are quite possibly the most useful tool that I’ve used in the relatively short time I’ve spent developing WPF applications.  They give the ability to format data, style controls, and more, based on the value supplied from a binding.  And it doesn’t even have to be a binding to a data source.  [...]

On a current Windows application we made the decision to use Windows Presentation Foundation (WPF) instead of the time-tested Windows Forms.  The main consideration was styling, because seriously, who wants an application that looks like Windows 95?
However, the project required a multiple document interface (MDI), which is not supported in WPF.
After some quick thinking, I [...]