Remove event handler from WPF DataGrid Template Column

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WPF

DataGrid

event

handler

How can i remove the event handler from a template column in a datagrid

My XAML:

<DataGrid x:Name="dg" AutoGenerateColumns="False" Margin="10,0,0,0">
                <DataGrid.Columns>
<DataGridTemplateColumn Header="Arrived">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <CheckBox x:Name="Arrived_chk" IsChecked="{Binding Path=Arrive}" Checked="Arrived_chk_Checked" Unchecked="Arrived_chk_Unchecked" />
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>

I have tried getting access to the control like so:

Dim chkbox As CheckBox = GetTemplateChild("Arrived_chk")

but this returns a null.

I need access to the control to remove the event handler while a certain sub takes place.

Thanks


UPDATE:

Still struggling with this I have tried using this:

dg.RemoveHandler(CheckBox.Checked, AddressOf Arrived_chk_Checked)

but still having no luck.