Private Const WM_LBUTTONUP As Int32 = &H202
		Private Const WM_LBUTTONDOWN As Int32 = &H201
		Private Declare Function PostMessage Lib "user32.dll" Alias "PostMessageA" ( _  
												ByVal hwnd As IntPtr, _ 
												ByVal wMsg As Int32, _ 
												ByVal wParam As Int32, _ 
												ByVal lParam As Int32) As Int32
		Private Sub Button1Click(sender As System.Object, e As System.EventArgs) _
  Handles ...
			Me.PostMessage(me.Button2.Handle, WM_LBUTTONDOWN, 0, 0)
			Me.PostMessage(me.Button2.Handle, WM_LBUTTONUP, 0, 0)
		End Sub
		Private Sub Button2Click(sender As System.Object, e As System.EventArgs) _
  Handles ...
			CType(sender, Button).Text = "has clicked!"
		End Sub