How to write C# code when using inkAnalyzer for visual foxpro

[Alan Wayne]

I would like to extend inkOverlay and inkAnalyzer to a visual foxpro form and have the inkOverlay and inkAnalyzer use the visual foxpro form as the writing canvas. Within C#, this works:

public partial class Form1 : Form
...
public Form1()
{
...
this.inkAnalyzer = new InkAnalyzer(this.inkOverlay.Ink, this)
...
}

When compiled to a com interop and passing the visual foxpro form, I receive the ole error of non-supported interface.

Thus in visual foxpro:
mycom = createobject("MyInkAnalayzer")
mycom.makeit(this.inkOverlay.Ink, thisform) <--error on interface.

How is this done?
Thank you