Use DataTrigger in DataGridTemplateColumn.CellStyle - wpf

Question

I have a datagrid as follows,
<DataGrid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3" ItemsSource="{Binding SelectedSet.Rows}" IsSynchronizedWithCurrentItem="True" AutoGenerateColumns="False" CanUserAddRows="False" Style="{StaticResource DataGridStyle2}" HeadersVisibility="Column" SelectedItem="{Binding SelectedItem}" EnableRowVirtualization="False">
<DataGrid.Columns>
<DataGridTemplateColumn Width="30*" Header="{StaticResource RangeColumnHeader}" HeaderStyle="{StaticResource HeaderStyle2}" SortMemberPath="StartValue">
<DataGridTemplateColumn.CellStyle>
<DataTrigger Binding="{Binding SelectedSet.IsDefault}" Value="True">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
<DataTrigger Binding="{Binding SelectedSet.IsDefault}" Value="False">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
</DataGridTemplateColumn.CellStyle>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DatGrid>
I Want use " SelectedSet's " IsDefault property to set cell's IsEnabled property.
I tried above code, which is not working.
Classes are defined as follows,
public class UCSetModel : ViewModelBase
{
private Set _SelectedSet;
public Set SelectedSet
{
get
{
return _SelectedSet;
}
set
{
_SelectedSet = value;
RaisePropertyChanged("SelectedSet");
}
}
}
public class Set
{
private ObservableCollection<Markers> _rows;
public ObservableCollection<Markers> Rows
{
get
{
return _rows;
}
set
{
_rows = value;
RaisePropertyChanged("Rows");
}
}
private bool _isDefault;
public bool IsDefault
{
get
{
return _isDefault;
}
set
{
_isDefault = value;
RaisePropertyChanged("IsDefault");
}
}
}
I want to bind to a property of the same 'SelectedSet' that the rows come from.

Answer 1

The markup you have posted won't even compile. This does:
<DataGridTemplateColumn.CellStyle>
<Style TargetType="DataGridCell">
<Style.Triggers>
<DataTrigger Binding="{Binding IsDefault}" Value="True">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGridTemplateColumn.CellStyle>
IsDefault is supposed to be a property of a Row object, i.e. you should remove "Set." from the binding path assuming that a row doesn't have a Set property.
If you want to bind to a property of the same SelectedSet that the rows come from, the binding should be defined like this:
<DataTrigger Binding="{Binding DataContext.SelectedSet.IsDefault, RelativeSource={RelativeSource AncestorType=DataGrid}}" Value="True">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>

Answer 2

This worked for me,
<DataTrigger Binding="{Binding Path=DataContext.SelectedSet.IsDefault,ElementName=SetWindow}" Value="True">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>