The States pane in Blend 4 does not appear to show the VisualStates declared on a UserControl using the TemplateVisualState attribute. Is this to be expected and if so why? Creating the States manually in Blend seems to work correctly.
User controls aren't typically designed to be modified or re-templated the same way that regular controls are.
Most of the time where you want a control to be editable and offer alternative animations (through the states panel for instance) you're going to want to build something that derives from a proper custom control type.