Binding in a custom style - wpf

Question

I'm using a DataGrid with several fixed columns.
Additionally, I'm dynamically adding columns which feature a custom style for their header, containing a CheckBox.
Here is the style:
<Style TargetType="DataGridColumnHeader" x:Key="CustomerColumnHeader">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Grid HorizontalAlignment="Center">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" HorizontalAlignment="Center" Margin="3,0,3,0" Text="{Binding}"/>
<StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Center">
<CheckBox Margin="0,2,5,0"/>
<TextBlock HorizontalAlignment="Stretch" TextAlignment="Center" Text="Interpolate"/>
</StackPanel>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="BorderThickness" Value="0,1,1,1"/>
</Style>
This is how I add the columns and set their style:
grid.Columns.Add(new CustomDataGridTextColumn()
{
HeaderStyle = (Style)grid.Resources["CustomerColumnHeader"],
Header = "Test",
IsReadOnly = false,
Binding = new Binding(binding),
Interpolate = true
});
Edit: Here is what my Column class looks like:
class CustomDataGridTextColumn : DataGridTextColumn
{
public bool Interpolate { get; set; }
}
It's nothing more than a DataGridTextColumn with a property added.
How can I bind the IsChecked property of the style's CheckBox to the Interpolate property of my CustomDataGridTextColumn?

Answer 1

You could try binding from the Checkbox.IsChecked property to your custom column property using a RelativeSource Binding. Try this:
<CheckBox Margin="0,2,5,0" IsChecked="{Binding Interpolate, RelativeSource={
RelativeSource AncestorType={x:Type YourXamlPrefix:CustomDataGridTextColumn}}}" />
Clearly though, if this works at all, then this will only work when the Style is applied to an object that has a parent of type CustomDataGridTextColumn and you have correctly declared the YourXamlPrefix namespace to the CLR namespace of your custom column in the XAML.