title: Pass Color to IValueConverter
body: <p>I am making a WPF application using the MVVM design pattern.  Part of the app is a signal strength bar.  We created it with just a rectangular user control and created a 4 column grid, so all we need to do is change either the background or foreground color of the control.</p>
  
  <p>My idea on how to do this is a simply store Boolean values for each of the 4 sections and use a value converter.  However, there are 3 instances of this control, each with a different color.  How can I pass the needed color into the converter?  I know converters have a parameter argument, but I haven't been able to find any examples using it, so I'm not even sure if the parameter argument is what I'm looking for.</p>