How to Access cell’s control of the row in Datagrid

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WPF

I am using the WPF datagrid, I have added the columns DataGridComboBoxColumn, DataGridTemplateColumn programatically.

I want every row (every comboBox) of the the column with the different datasource may be first row’s ComboBox will have 5 items and second row’s ComboBox will have 3 items.

------------added blank StackPanel ---------------

<UserControl.Resources>
        <DataTemplate x:Key="manageAreaCellTemplate">
            <StackPanel Orientation="Horizontal">
            </StackPanel>
        </DataTemplate>
</UserControl.Resources>

//--------------Added Column ------------
DataGridTemplateColumn dgTemplateColumn = new DataGridTemplateColumn();
dgTemplateColumn.Width = new DataGridLength(1, DataGridLengthUnitType.Star);
dgTemplateColumn.Header = "Manage Options";
dgTemplateColumn.CellTemplate = this.FindResource("manageAreaCellTemplate") as DataTemplate;
dataGrid1.Columns.Add(dgTemplateColumn);
//-------------- dataGrid1_LoadingRow  Event------------

void dataGrid1_LoadingRow(object sender, Microsoft.Windows.Controls.DataGridRowEventArgs e)
{
            DataTemplate dt = (DataTemplate)e.Row.FindResource("manageAreaCellTemplate");
            object stk = dt.LoadContent();
            StackPanel stk1 = new StackPanel();
            stk1 = (StackPanel)stk;
            ComboBox cmb = new ComboBox();
            PortInfoCollection portInfoCollection = new PortInfoCollection();
            cmb.ItemsSource = portInfoCollection;
            cmb.SelectedValuePath = "Visits";
            cmb.DisplayMemberPath = "Port";
            stk1.Children.Add(cmb);
}

My problem is combobox is not getting populated in the grid.