Editable combo in propertygrid

Hi..
am trying to add items in the combobox during runtime..
The Combobox is placed inside the propertygrid..

The below code is how i made the combobox..

Code:

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Public Class Employee
Private m_name As String
  <TypeConverter(GetType(Properties)), CategoryAttribute("Gender"), DefaultValueAttribute("Male")> _
    Public Property Gender() As String
        Get
            Return m_name
        End Get
        Set(ByVal Value As String)
            m_name = Value
        End Set
 End Property

'Here the properties class
Imports System.ComponentModel

Public Class Properties : Inherits System.ComponentModel.StringConverter
      Dim Names() As String = New String() {"Welder", "HorsePower"}
    Public Overloads Overrides Function GetStandardValues(ByVal context As System.ComponentModel.ITypeDescriptorContext) As System.ComponentModel.TypeConverter.StandardValuesCollection
        Return New StandardValuesCollection(Names)
    End Function
    Public Overloads Overrides Function GetStandardValuesSupported(ByVal context As System.ComponentModel.ITypeDescriptorContext) As Boolean
        Return True
    End Function
    '''
    Public Overloads Overrides Function GetStandardValuesExclusive(ByVal context As System.ComponentModel.ITypeDescriptorContext) As Boolean
        Return True
    End Function
End Class

' in the form load..
PropertyGrid1.SelectedObject = New Employee

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now i want to add/edit the combobox items..
is it possible..