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I have a datagrid whose one of the header column is Three-state checkbox. The celltemplate for that column contains two state checkbox + AllItems CheckBox - Item1 - Item2 - Item3 .. I wanted to use AllItems checkbox to select/unselect all items (item1,item2) which works fine. Next I wanted to set AllItems checkbox to intermediate state when not all items are selected/unselected. Similarly I wanted to set AllItems checkbox as checked/unchecked when all items get manually selected. Here is the code that I tried... <dg:DataGridTemplateColumn.HeaderTemplate> <DataTemplate> <StackPanel x:Name="StackPanelForItemCheckbox" Orientation="Horizontal"> <CheckBox x:Name="AllItemSelectionCheckBox" HorizontalAlignment="Left" Cursor="Hand" IsChecked="{Binding IsAllItemChecked, Mode=TwoWay}" IsThreeState="True" Checked="ItemSelectionCheckBox_Checked" Unchecked="ItemSelectionCheckBox_Unchecked" Click="AllItemSelectionCheckBox_Click"> <TextBlock x:Name="ItemNameTextBlock" Text="Item" Margin="10,0,0,0"> ...... <dg:DataGridTemplateColumn.CellTemplate> <DataTemplate x:Name="ItemCheckDataTemplate"> <StackPanel x:Name="ItemCheckBoxStackPanel" Orientation="Horizontal"> <CheckBox x:Name="itemCheckBox" Cursor="Hand" IsChecked="{Binding IsItemChecked, Mode=TwoWay}" Click="ItemSelectionCheckBox_Click"></CheckBox> <TextBlock x:Name="ItemNameTextBlock" Text="{Binding Path=Item}"> </TextBlock> </StackPanel> </DataTemplate> ... "ItemSelectionCheckBox_Click" method looks for all three state (all-checked, none-ch

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