How to access checkbox from datagrid template column?

Question

Ok this has been asked many times but I just can't find the right solution. I have datagrid defined like this:

<DataGrid AutoGenerateColumns="False"
      IsReadOnly="True"
      Name="InputDocItemsDataGrid"
      ItemsSource="{Binding Path= InputItems}" 
      SelectedItem="{Binding Path= InputItem, UpdateSourceTrigger=PropertyChanged}"
      SelectionChanged="InputDocItemsDataGrid_SelectionChanged"
      PreviewMouseLeftButtonDown="InputDocItemsDataGrid_PreviewMouseLeftButtonDown">
    <DataGrid.Columns>
        <DataGridTemplateColumn CanUserReorder="False" CanUserResize="False">
            <DataGridTemplateColumn.HeaderTemplate>
                <DataTemplate>
                    <CheckBox Name="cbxAll" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" Checked="cbxAll_Checked" />
                </DataTemplate>
            </DataGridTemplateColumn.HeaderTemplate>
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <CheckBox Name="cbxSingleRow" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" PreviewMouseLeftButtonDown="cbxSingleRow_PreviewMouseLeftButtonDown" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

Well I added only this template column here becouse it's the point of interest. So what I'm trying to manage is to access checkobx "cbxSingleRow" as it is outside of datagrid, so i would be able to do all the regular stuff with it like for example: cbxSingleRow.IsEnabled = false;

So how do I get that checkbox?

"all the regular stuff" is done via DATABINDING in WPF. not procedural code. — Fede
– Fede, Commented Jan 29, 2014 at 16:53
I'm aware of that, I just need to access that checkbox from codebehind like it is any other checkbox outside of datagrid? Is there any clear solution to get that effect? — Stojdza
– Stojdza, Commented Jan 29, 2014 at 16:58
I just need to access that checkbox from codebehind - what for? whatever you want to do, do it via DataBinding. — Fede
– Fede, Commented Jan 29, 2014 at 18:37
hi Stojdza,,,,i m facing same problem..u have solution about it? — SANDEEP
– SANDEEP, Commented Feb 14, 2015 at 5:20
@SANDEEP hay there! Yes I have solved it by using visual tree helper class as Rohit described in his answer but just a little bit different. Also there is another approach to access controls inside a DataGrid via databinding and using of RelativeSource property. If you need some more info let me know. — Stojdza
– Stojdza, Commented Mar 3, 2015 at 12:18

Rohit Vats · Accepted Answer · 2014-01-29 17:29:04Z

You can get that with the help of VisualTreeHelper class.

Move this method in some utility class so that can be reused.

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj,
                                         string name) where T : DependencyObject
{
    if (depObj != null)
    {
       for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
       {
          DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
          if (child != null && child is T &&
                (child as FrameworkElement).Name.Equals(name))
          {
             yield return (T)child;
          }

          foreach (T childOfChild in FindVisualChildren<T>(child, name))
          {
             yield return childOfChild;
          }
       }
    }
}

Usage:

foreach (CheckBox checkBox in UtilityFunctions.
             FindVisualChildren<CheckBox>(InputDocItemsDataGrid, "cbxSingleRow"))
{           
   checkBox.IsChecked = true;
}

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