BreakPoint Not Working In Init - InitComplete - PreLoad Events In Page With C# In VS2008

BreakPoint not working in Init, InitComplate, PreLoad events in ASP.NET page with C# in VS2008. But it is working for Page_Load event.

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void InitializeComponent()
{
this.PreLoad += new System.EventHandler(this._Default_PreLoad);
this.InitComplete += new System.EventHandler(this._Default_InitComplete);
this.Init += new System.EventHandler(this._Default_Init);
this.PreRender += new System.EventHandler(this._Default_PreRender);
this.PreInit += new System.EventHandler(this._Default_PreInit);
this.SaveStateComplete += new System.EventHandler(this._Default_SaveStateComplete);
}
protected void _Default_InitComplete(object sender, EventArgs e)
{
........
}
protected void _Default_Init(object sender, EventArgs e)
{
.........
}
protected void _Default_PreLoad(object sender, EventArgs e)
{
..........
}
}