uncheck Select All chkbox if any one of chkbox is unchecked

Question

I have a checkbox named chkSelectAll which placed in header. When I click this then all other check boxes inside my DataGrid is Checked. But I want when anyone of the checkbox inside the grid will be unchecked then this chkSelectAll Checkbox will automatically uncheck.

<DataGridTemplateColumn> Please check below code .

<DataGridTemplateColumn.Header>

<CheckBox x:Name="chkSelectAll" Content="Select All" />

</DataGridTemplateColumn.Header>

<DataGridTemplateColumn.CellTemplate>

<DataTemplate>

<CheckBox Name="chkCellTemp" Margin="45 2 0 0">

<CheckBox.Style>

<Style TargetType="{x:Type CheckBox}">

<Setter Property="IsChecked" Value="False" />

<Style.Triggers>

<DataTrigger Binding="{Binding IsChecked, ElementName=chkSelectAll, Mode=TwoWay}" Value="True">

<Setter Property="IsChecked" Value="True"/>

</DataTrigger>

</Style.Triggers>

</Style>

</CheckBox.Style>

</CheckBox>

</DataTemplate>

</DataGridTemplateColumn.CellTemplate>

</DataGridTemplateColumn>