need help with cross-thread delagates

[sv13]

hi, i have went through countless examples of how to use delegates, and still no success
here is my problem:

WFA application

//myClassA.cs
class myClassA 
{
     private AddLabel(string text) // add few labels on the Panel which is placed on the form
     {
           // got ref to panel 'p' so i just call
           p.Controls.Add( //my new label);
     }
}

//myClassB.cs
class myClassB 
{
      public void OnDataReceived // receiving data from socket, new thread
     {       
          now i need to call method from myClassA - AddLabel("some text")
          to add new label on the panel,   how ?
     }
}

//Form1.cs
public partial class Form1 : Form
{
      private myClassA objA;
      private myClassB objB;

     // i can call objA.AddLabel and its working fine, but i need to call that method inside myClassB
}