Custom System.Windows.VisualStateManager that intercepts validation states raised by the system and changes focus state to consider whether the focus is within the control and allows simplifying the development of controls that aren't just textbox but a combination of textbox and buttons or other elements.

'Declaration
 
<NameScopePropertyAttribute("NameScope", System.Windows.NameScope)>
Public Class EnhancedValidationVisualStateManager 
   Inherits System.Windows.VisualStateManager

[NameScopeProperty("NameScope", System.Windows.NameScope)]
public class EnhancedValidationVisualStateManager : System.Windows.VisualStateManager