I have a class that inherits user control:
       public partial class ValidationSubDesigner : UserControl {

It works jsut fine, the problem occurs when I try to inherit it:
   public partial class FieldCompareFieldDesigner : ParamDesigner {
   //public partial class FieldCompareFieldDesigner : UserControl {

The top line is required in order to compile, the second line is
required in order to get the designer view to work.   I get the error
below when I try to bring up the designer view.

The full eror and stack trace.

One or more errors encountered while loading the designer. The errors
are listed below. Some errors can be fixed by rebuilding your project,
while others may require code changes.

Constructor on type
'AbacusControls.PropertyEditors.Designer.ValidationDesigner.SubDesigners.Test'
not found.
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at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.ComponentModel.Design.DesignSurface.CreateInstance(Type type)
at Microsoft.VisualStudio.Design.VSDesignSurface.CreateInstance(Type
type)
at
System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost.CreateComponent(Type
componentType, String name)
at
System.ComponentModel.Design.Serialization.DesignerSerializationManager.CreateInstance(Type
type, ICollection arguments, String name, Boolean addToContainer)
at
System.ComponentModel.Design.Serialization.DesignerSerializationManager.System.ComponentModel.Design.Serialization.IDesignerSerializationManager.CreateInstance(Type
type, ICollection arguments, String name, Boolean addToContainer)
at
System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager
manager, CodeTypeDeclaration declaration)
at
System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager
manager)
at
Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager
serializationManager)
at
Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32
fReload)