C# Definition:

[ComImport]
[Guid("TODO")]
//TODO: Insert [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] if this doesn't derive from IDispatch
interface ICustomDoc {
   TODO;
}

VB Definition:

Imports System.Runtime.InteropServices

<ComImport(), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), _
Guid("3050f3f0-98b5-11cf-bb82-00aa00bdce0b")> _
Interface ICustomDoc
    <PreserveSig()> _
    Sub SetUIHandler(ByVal pUIHandler As IDocHostUIHandler)
End Interface

User-Defined Types:

None.

Notes:

None.