Is it possible to programmatically change the geometry of the node(s) within a Symbol?

public class MySymbol : Symbol
{
public MySymbol()
{
// Custom symbol initialization
// Original line segment in the symbol spanning points (20,30) to (40,30)
this.innerLine = new Line(new PointF(20,30), new PointF(40,30));
this.AppendChild(this.innerLine);
}
// Changing the geometry of a node in the symbol
public void IncreaseLineLength()
{
// Use the ILocalPoints interface to dynamically access and change the line geometry
// The following code changes the line's end point from (40,30) to (60,30)
IServiceProvider svcprovider = this.innerLine as IServiceProvider;
ILocalPoints localpoints = (ILocalPoints)svcprovider.GetService(typeof(ILocalPoints));
Debug.Assert(svcprovider != null);
PointF[] pts = localpoints.GetPoints();
Trace.WriteLine(pts[0].ToString(), pts[1].ToString());
// Set the new end point of the line to be PointF(60,30);
localpoints.SetPoint(1, new PointF(60,30));
}
}

Public Class MySymbol Inherits Symbol
Public Sub New()
' Custom Symbol initialization
' Original line segment in the custom symbol spanning points (20,30) to (40,30)
Me.innerLine = New Line(New PointF(20, 30), New PointF(40, 30))
Me.AppendChild(Me.innerLine)
End Sub
Public Sub IncreaseLineLength()
' Use the ILocalPoints interface to dynamically access and change the line geometry
' The following code changes the line's end point from (40,30) to (60,30)
Dim svcprovider As IServiceProvider = Me.innerLine
Dim localpoints As ILocalPoints = CType(svcprovider.GetService(GetType(ILocalPoints)), ILocalPoints)
Debug.Assert( Not (svcprovider Is Nothing))
Dim pts As PointF() = localpoints.GetPoints()
Trace.WriteLine(pts(0).ToString(), pts(1).ToString())
' Set the new end point of the line to be PointF(60,30)
localpoints.SetPoint(1, New PointF(60, 30))
End Sub
End Class 'MySymbol