[SOLVED] Inherited Control Visible/Enabled Property Value Always True: PropertyGrid

I have created a custom WinForms hosting environment. Which has a toolbox and a PropertyGrid.

The controls displayed in the Toolbox are inherited from existing WinForm controls.

DropDownList Source:

public interface IPropertyFilter : ICustomTypeDescriptor
{
    PropertyDescriptorCollection FilterProperties(PropertyDescriptorCollection pdc);
    List<string> GetPropertiesToShow();
}

[Serializable]
public class DropDownList : System.Windows.Forms.ComboBox, IPropertyFilter
{
    public DropDownList()
    {
    }

    #region IPropertyFilter Members

    public TypeConverter GetConverter()
    {
        return TypeDescriptor.GetConverter(this, true);
    }

    public EventDescriptorCollection GetEvents(Attribute[] attributes)
    {
        return TypeDescriptor.GetEvents(this, attributes, true);
    }

    EventDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetEvents()
    {
        return TypeDescriptor.GetEvents(this, true);
    }

    public string GetComponentName()
    {
        return TypeDescriptor.GetComponentName(this, true);
    }

    public object GetPropertyOwner(PropertyDescriptor pd)
    {
        return this;
    }

    public AttributeCollection GetAttributes()
    {
        return TypeDescriptor.GetAttributes(this, true);
    }

    public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
    {
        PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(this, attributes, true);
        return FilterProperties(pdc);
    }

    PropertyDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetProperties()
    {
        PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(this, true);
        return FilterProperties(pdc);
    }

    public object GetEditor(Type editorBaseType)
    {
        return TypeDescriptor.GetEditor(this, editorBaseType, true);
    }

    public PropertyDescriptor GetDefaultProperty()
    {
        return TypeDescriptor.GetDefaultProperty(this, true);
    }

    public EventDescriptor GetDefaultEvent()
    {
        return TypeDescriptor.GetDefaultEvent(this, true);
    }

    public string GetClassName()
    {
        return TypeDescriptor.GetClassName(this, true);
    }

    public PropertyDescriptorCollection FilterProperties(PropertyDescriptorCollection pdc)
    {
        // Filter out properties that we do not want to display in PropertyGrid
        return ControlDesignerHelper.GetBrowsableProperties(pdc, GetPropertiesToShow());
    }

    // Determines what properties of this control has to be shown in PropertyGrid
    public List<string> GetPropertiesToShow()
    {
        // get a list of common properties that we want to show for all controls
        List<string> browsableProps = ControlDesignerHelper.GetBasePropertiesToShow();
        // add properties that are specific to this controls
        browsableProps.Add("Items");
        browsableProps.Add("AutoPostBack");
        browsableProps.Add("AppendDataBoundItems");
        browsableProps.Add("DataTextField");
        browsableProps.Add("DataValueField");
        return browsableProps;
    }

    #endregion
}

I have implemented ICustomTypeDescriptor to filter out properties that I do not want to show in the PropertyGrid.

Problem:

I am facing problem while serializing values of Enabled & Visible properties that are inherited from System.Windows.Forms.Control class.

WriteProperties Method (BasicDesignerLoader):

private void WriteProperties(XmlDocument document, PropertyDescriptorCollection properties, object value, XmlNode parent, string elementName)
{
    foreach (PropertyDescriptor prop in properties)
    {
        System.Diagnostics.Debug.WriteLine(prop.Name);

        if (prop.ShouldSerializeValue(value))
        {
            string compName = parent.Name;
            XmlNode node = document.CreateElement(elementName);
            XmlAttribute attr = document.CreateAttribute("name");

            attr.Value = prop.Name;
            node.Attributes.Append(attr);

            DesignerSerializationVisibilityAttribute visibility = (DesignerSerializationVisibilityAttribute)prop.Attributes[typeof(DesignerSerializationVisibilityAttribute)];

            switch (visibility.Visibility)
            {
                case DesignerSerializationVisibility.Visible:
                    if (!prop.IsReadOnly && WriteValue(document, prop.GetValue(value), node))
                    {
                        parent.AppendChild(node);
                    }

                    break;

                case DesignerSerializationVisibility.Content:
                    object propValue = prop.GetValue(value);

                    if (typeof(IList).IsAssignableFrom(prop.PropertyType))
                    {
                        WriteCollection(document, (IList)propValue, node);
                    }
                    else
                    {
                        PropertyDescriptorCollection props = TypeDescriptor.GetProperties(propValue, propertyAttributes);

                        WriteProperties(document, props, propValue, node, elementName);
                    }

                    if (node.ChildNodes.Count > 0)
                    {
                        parent.AppendChild(node);
                    }

                    break;

                default:
                    break;
            }
        }
    }
}

Problem # 1: The ShouldSerializeValue method for the Enabled & Visible property always returns false.

Problem # 2: Even if I skip the ShouldSerializeValue method check the GetValue method of the PropertyDescriptor always returns True.

Current Workaround: As a workaround I have currently made the Enabled & Visible properties hidden using the BrowsableAttribute, and created two other boolean properties and used the DisplayNameAttribute to change their display name to be Enable & Visible.

But for this workaround I have to write these snippets in every control.

Am I missing something or doing anything wrong? Why are the Enabled & Visible property do not change?