create a new property for datagridviewcolumncollection

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VB

Hai

I want to create a new property for datagridviewcolumncollection
I created a class which inherits datagridviewcolumncollection

Public Class NewDataCol Inherits datagridviewcolumncollection

and added some New property here.
after that created a new class which inherits Datagridview

Public class IGrid inherits Datagridview

Here I use this code.

Private ColCollection As NewDataCol

  
    Public Overloads Property columns() As NewDataCol
        Get
            Return ColCollection
        End Get
        Set(ByVal value As NewDataCol)
            ColCollection = value
        End Set
    End Property

When i add Igrid to a form I can't see any new property.
Please tell me how to do it.

Thanks