Error in WPF : ....does not contain a definition for 'CloseButton_Click' and no extension method 'CloseButton_Click' accepting a first argument of type 'x.y'

Error	1	'NezamMohandesi.WindowManager' does not contain a definition for 'CloseButton_Click' and no extension method 'CloseButton_Click' accepting a first argument of type 'NezamMohandesi.WindowManager' could be found (are you missing a using directive or an assembly reference?)	D:\Project\WPFNezamMohandesi\NezamMohandesi\NezamMohandesi\WindowsStyles.xaml	45	108	NezamMohandesi

<Button x:Name="Close" Content="Button" Width="27" Margin="2,2,0,2" Style="{DynamicResource ButtonClose}" Click="CloseButton_Click" />

public class WindowsManager : ResourceDictionary
   {
       public WindowsManager()
       {
           // Insert code required on object creation below this point.
       }

       public void CloseButton_Click(object sender, EventArgs e)
       {
           Window window = ((FrameworkElement)sender).TemplatedParent as Window;
           if (window != null)
               window.Close();

       }
   }