how to go to trigger an event outside a constructor in wpf

no a tool tip
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace MotionControl.Resources.Stencils
{
partial class MicroPositionStencil : ResourceDictionary

{
public MicroPositionStencil()
{
InitializeComponent();



}
private void image_MouseEnter(object sender, MouseButtonEventArgs e)
{
ToolTip tooltipParam = new ToolTip();
tooltipParam.Content = "hey";


ToolTipService.SetToolTip(image1, tooltipParam);


tooltipParam.IsOpen = true;
}

}
}