All kinds, I just started designing the form. Any action that will trigger Visual Studio to rewrite it's InitializeComponenet method. The change I made that caused the error was adding an event handler to a button. Of course I could code these things without using the designer, but I'm trying to understand why the designer thinks it has to initialize the user control's properties when it doesn't need to.
A solution I just found is to add the following attribute to the properties:
[DesignerSerializationVisibilityAttribute (DesignerSerializationVisibility.Hidden)]
to prevent the designer from serializing these properties to the InitializeComponent method. I still do not fully understand why it was getting the error in the first place though.