How to create Editable unbound Datagrid

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VB

WPF

DataGrid

Hai
I am new to wpf. I want to create an user control unbound datagrid in wpf

I inherited a datagrid


XAML Code is

<datagrid x:class="MyGrid" xmlns:x="#unknown">
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:NewGrid"
             mc:Ignorable="d" 
             d:DesignHeight="180.397" d:DesignWidth="320.354" removed="{x:Null}" AutoGenerateColumns="False" ColumnHeaderHeight="25"  RowHeaderWidth="20" ClipboardCopyMode="IncludeHeader" SelectionMode="Single" SelectionUnit="Cell" EnableRowVirtualization="False" HeadersVisibility="None" CanUserAddRows="False" >
</datagrid>

In Code Window

    Private Sub MyGrid_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
        Me.Items.Add(Me.Items()) ' Used to add an empty row on start
    End Sub

Private Sub MyGrid_PreviewKeyDown(sender As Object, e As KeyEventArgs) Handles Me.PreviewKeyDown    
	If m_AddRow = True Then
		Me.Items.Add(Me.Items())
       End If

End Sub

My problem is

When I run this by adding a new grid it shows this error
'EditItem' is not allowed for this view.

Please help me , how to create editable unbound grid. I don't want data bound grid.