C#

<br />
this.textBox1.SelectionStart<br />

<br />
this.textBox1.Text = this.textBox1.Text.Insert(this.textBox1.SelectionStart,"test");<br />

<code>
   Point p = this.Form1.PointToClient(this.Control1.PointToScreen(new Point(e.X,e.Y)));
   this.Control1MouseX = p.X;
   this.Control1MouseY = p.Y;
</code>

<code>
   Control NewControl1 = new Control();
   NewControl1.Location = new Location(this.Control1MouseX,this.Control1MouseY);
   Form.Controls.Add(NewControl1);
</code>

public delegate void OnClickStart(object,SystemEventArgs);
public event OnClickStart ClickStart;


private void button1_Clicked(object sender, SystemEventArgs e)
{
   if(this.ClickStart != null)
   {
      this.ClickStart(sender,e);
   }
}

CustomControl cc = new CustomControl;
cc.ClickStart += new cc.OnClickStart(Mainform_ClickStart);

public void Mainform_ClickStart(object sender, SystemEventArgs e)
{
   //Make sure that if you do anything in here that could cause the form to PAINT that you
   //Use the this.Invoke method to invoke your MainForm methods.  If you do not do this
   //you could have major threading issues and your form could lock up
}