Set default value in WPF datagridviewcomboboxcolumn of data grid

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WPF

My Design part is this

<datagridcomboboxcolumn selectedvaluebinding="{Binding Path=ServiceReqStatusID}" selectedvaluepath="ID" displaymemberpath="Name" header="Status" minwidth="100" itemssource="{Binding Source={StaticResource customerDataProvider1}}">



Back end code is this


CollectionViewSource objStatus = this.FindResource("customerDataProvider1") as CollectionViewSource;

objStatus.Source = serviceRequestManager.getStatusForCombo();[in here load my data]

now i wants a default data to set grid combobox

What I have tried:

My Design part is this

<DataGridComboBoxColumn SelectedValueBinding="{Binding Path=ServiceReqStatusID}"                                            
                                           SelectedValuePath="ID"
                                           DisplayMemberPath="Name"
                                           Header="Status"
                                           MinWidth="100"
                                           ItemsSource="{Binding Source={StaticResource customerDataProvider1}}">
                </DataGridComboBoxColumn>


Back end code is this


  CollectionViewSource objStatus = this.FindResource("customerDataProvider1") as CollectionViewSource;
     
            objStatus.Source = serviceRequestManager.getStatusForCombo();[in here load my data]

now i wants a default data to set grid combobox