Change datatrigger binding programmatically

I have a listbox which uses an itemtemplate and is bound to a datatable.
I am using datatriggers to do some of the formatting depending on the data in a particular column.
What I want to do is change the binding on the datatrigger programmatically, eg change it from binding to colOne to binding to colTwo.
Can anyone tell me how I can access the triggers and change the binding from code?

Code:

---

  <ListBox DockPanel.Dock="Top" Name="ListBox1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Margin="2" x:Name="txtOne" Text="{Binding Path=ColOne}"></TextBlock>
                        <TextBlock Margin="2" x:Name="txtTwo" Text="{Binding Path=ColTwo}"></TextBlock>
                        <TextBlock Margin="2" x:Name="txtName" Text="{Binding Path=Name}"></TextBlock>
                    </StackPanel>

                    <DataTemplate.Triggers>
                        <DataTrigger x:Name="trigZero" Binding="{Binding Path=ColOne}" Value="0">
                            <Setter TargetName="txtName" Property="Background" Value="White"></Setter>
                        </DataTrigger>
                        <DataTrigger x:Name="trigOne" Binding="{Binding Path=ColOne}" Value="1">
                            <Setter TargetName="txtName" Property="Background" Value="Gray"></Setter>
                        </DataTrigger>
                    </DataTemplate.Triggers>

                </DataTemplate>
            </ListBox.ItemTemplate>
  </ListBox>

---

I've never tried this before so maybe this isnt the best way but here is what I came up with:

To access the first trigger in your datatemplate:

vb Code:

Dim trigzero As DataTrigger = DirectCast(ListBox1.ItemTemplate.Triggers(0), DataTrigger)

Now you can access the Binding property of that object and I assume that is what you were after :)