如何在设计模式下调试WPF用户控件？

I have a wpf user control I created that contains a label. The label's foreground setting changes based on some code that checks a number of conditions. The label in my control is displaying the wrong color at design time but I cannot figure out how to debug my user control at design time so that I can have it catch breakpoints (and thus figure out where my logic is flawed). The color on the control is correct at run-time, it is only at design time that it is displayed incorrectly.I have a wpf user control I created that contai