Ajaxtoolkit combobox in gridview

Question

I'm having UI problems with ajaxtoolkit's combo box inside gridview.

 <asp:Gridview Id="grv" runat="server" AutoGenerateColumns="False" CellPadding="4">
  <Columns>
    <asp:TempalteField>
        <ItemTemplate>
              <cc1:ComboBox ID="cmbGrdOrigin" runat="server"  AutoCompleteMode="Suggest" Visible="false" DropDownStyle="DropDown"
                            AutoPostBack="true">
                            <asp:ListItem Text="" Value="" />
                            <asp:ListItem Text="Domestic" Value="Domestic" />
                            <asp:ListItem Text="Foreign" Value="Foreign" />
              </cc1:ComboBox>
        </ItemTemplate>
    <asp:TempalteField>
  </Columns>
 </asp:Gridview>    

The problem is the list of items are not showing. The combobox item list does not overlap with the cell below it.

Added photo for reference. all the combobox on the grid does not work https://drive.google.com/open?id=0B4JBZR0AZcx9WjNkbjM5UkZ1Y2c