C# WPF datagrid template column with combobox having different datasource

I have a window with 2 controls. One is a combobox (cmbUnit) and another is a DataGrid (dgvProducts)

cmbUnits is binded with List<Unit> collection & the Unit class is below

public class Unit
{
   public int ID { get; set; }
   public string Name { get; set; }
}

Note : Display member is Name & Value member is ID

Where as, dgvProducts is binded with List<Product> Collection & the Product class is below

public class Product
{
       public int ID { get; set; }
       public string ProductName { get; set; }
       public int UnitID { get; set; }
}

Here, i am selecting UnitID from my db table (TBL_PRODUCTS), I can also retrieve UnitName by joining table. for now, i want to keep only UnitID in my Product class.

My question is, My datagrid has a column (datagridTemplateColumn) with a combobox as the child, and i want to show the UnitName inside it by passing UnitID same like my combobox control (cmbUnit)

My Datas inside datagrid should be

--------------------------------------------------
ID      UnitName     ProductName
--------------------------------------------------
12345    Kg         Sample Product

Where Kg should be displayed inside a combobox. How to achieve this ? Help me !

My XAML code for cmbUnit is

<ComboBox Grid.Column="7" Grid.Row="1" Name="cmbUnit" ></ComboBox>

where i bind datas to this control from code behind.

XAML for dgvProducts

<DataGrid AutoGenerateColumns="False" Grid.ColumnSpan="2"
              Name="dgvProduct"  
              Grid.Row="2">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="ID" Width="50" CanUserSort="True">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Label VerticalContentAlignment="Center" Content="{Binding ID}"></Label>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn Header="Unit" Width="*">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <ComboBox IsEnabled="False"
                            Name="cmbGrUnit"
                            ItemsSource="{Binding Units}"
                            DisplayMemberPath="Name"
                            SelectedValuePath="ID"
                            SelectedValue="{Binding UnitID}"
                            ></ComboBox>
                        <!--<Label VerticalContentAlignment="Center" Content="{Binding Name}"></Label>-->
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTemplateColumn Header="Product Name" Width="*">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Label VerticalContentAlignment="Center" Content="{Binding ProductName}"></Label>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn></DataGrid.Columns>

Thanks