Custom DataGrid Control

I am creating a custom DataGrid control and am running into a problem. When I add my control to the webform, it says "Error Creating Control".
I know it has something to do with me trying to add default columns, but I don't know why.
When you drop the ASP.NET DataGrid on a webform it renders with 3 columns (0,1 and 2) then abc in all the cells.
That is what I am trying to do, but if I don't try to add default columns it just renders as a gray bar (like a user control).
Any ideas on how I can get it to render like the built in datagrid???

Here's the code

VB Code:

Imports System
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.ComponentModel
Imports System.Drawing
 
Public Class JHADataGrid
    Inherits DataGrid
 
    Private JHADataGrid As DataGrid
    Private HeaderStyleProps As HeaderStyleProperties
    Private AlternatingItemStyleProps As AlternatingItemStyleProperties
 
    Public Sub New()
        Dim i As Integer
        Dim dgColumn As DataGridColumn
 
        JHADataGrid = New DataGrid
        HeaderStyleProps = New HeaderStyleProperties
        AlternatingItemStyleProps = New AlternatingItemStyleProperties
 
        JHADataGrid.ID = "JHADataGrid1"
        [color=red]This is the area in question
        For i = 1 To 3
            JHADataGrid.Columns.Add(dgColumn)
        Next
       [/color]
 
    End Sub
 
    <DefaultValue(""), _
    Category("HeaderStyle"), _
    PersistenceMode(PersistenceMode.InnerProperty)> _
    Public Shadows Property [HeaderStyle]() As HeaderStyleProperties
        Get
            Return HeaderStyleProps
        End Get
        Set(ByVal Value As HeaderStyleProperties)
            HeaderStyleProps = Value
        End Set
    End Property
 
    <DefaultValue(""), _
    Category("AlternatingItemStyle"), _
    PersistenceMode(PersistenceMode.InnerProperty)> _
    Public Shadows Property [AlternatingItemStyle]() As AlternatingItemStyleProperties
        Get
            Return AlternatingItemStyleProps
        End Get
        Set(ByVal Value As AlternatingItemStyleProperties)
            AlternatingItemStyleProps = Value
        End Set
    End Property
 
    Protected Overrides Sub render(ByVal writer As HtmlTextWriter)
        EnsureChildControls()
        MyBase.Render(writer)
    End Sub
 
    Protected Overrides Sub CreateControlHierarchy(ByVal useDataSource As Boolean)
 
    End Sub
 
    Protected Overrides Sub PrepareControlHierarchy()
 
    End Sub
 
    'Hide the Font property in the properties window
    <Browsable(False), _
    EditorBrowsable(EditorBrowsableState.Never)> _
    Public Overrides ReadOnly Property Font() As FontInfo
        Get
            Return MyBase.Font
        End Get
    End Property
End Class