Selection of CheckBox

<Window x:Class="WpfApplication5.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel Margin="8">
    <ListView
      Name="listView"

      ItemsSource="{Binding}"
      >
      <ListView.View>
        <GridView>
          <GridViewColumn Header="ID" DisplayMemberBinding="{Binding ID}" />
          <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" />
          <GridViewColumn Header="Balance" Width="140">


            <GridViewColumn.CellTemplate>
              <DataTemplate>

                <CheckBox Tag="{Binding}" Name="Complete" IsThreeState="False" Checked="onButtonClick" />


              </DataTemplate>
            </GridViewColumn.CellTemplate>
          </GridViewColumn>
        </GridView>
      </ListView.View>
    </ListView>

    <Button Margin="4,10">GetAllEvents</Button>


  </StackPanel>
</Window>