[ProvideProperty("BalloonTitle", typeof(Control))]
public class TitleProvider:Component, IExtenderProvider

{

protected Hashtable titles = new Hashtable ();

bool IExtenderProvider.CanExtend(object target) 
{

if ((target is Control) && !(target is TitleProvider))
{
return true;
}
return false;

}

public void SetBalloonTitle(Control c, string Text)
{
if ( Text == null && titles.Contains (c)) 
{
titles.Remove (c); 
return;
}

titles[c] = Text;
}

public string GetBalloonTitle(Control c)
{
if (titles.Contains(c) == false)return ""; 
return (string)titles[c];
}
}

this.balloonToolTip1.SetBalloonTitle(this.button4, "");
this.button4.Location = new System.Drawing.Point(112, 144);
this.button4.Name = "button4";
.....