Bind Datatable To ComboBox in datagridTemplateColmun

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C#3.5

DataGrid

hi Every
one i has WPF DataGrid and it has Column Called Code it is a datagridtemplateColumn , i put ComboBox in this Column but i try to fill the comboBox IemsSource and i could not reach to the Combo Box From Code (This.Cmx_Code.ItemsSource is Not Allowed ) so how can i fill the itemsSource of the Combo Box

<datagridtemplatecolumn loc:translate.uid="1658" header="Code" width="*" xmlns:x="#unknown" xmlns:loc="#unknown">
                    <datagridtemplatecolumn.celltemplate>
                        <datatemplate>
                            <combobox x:name="Cmx_Code" selectionchanged="Cmx_Kind_SelectionChanged" itemssource="{Binding}">
                                <combobox.displaymemberpath>Code</combobox.displaymemberpath>
                                <combobox.selectedvaluepath>Med_ID</combobox.selectedvaluepath>
                                <combobox.selectedvalue>
                                    <binding>
                                        <binding.path>Med_ID</binding.path>
                                        <binding.mode>TwoWay</binding.mode>
                                        <binding.updatesourcetrigger>PropertyChanged</binding.updatesourcetrigger>
                                    </binding>
                                </combobox.selectedvalue>
                            </combobox>
                        </datatemplate>
                    </datagridtemplatecolumn.celltemplate>                    
                </datagridtemplatecolumn>