Why/How two objects require Widening/Narrowing conversions

[!NoItAll]

I'm a bit lost...
I have two objects implemented as UserControls (compiled as separate DLLs). Both have implemented a specific property that is, in itself, an object. I need to pass this object between the two UserControls. Both of these internal properties are created separately and contain properties named the same and are typed the same. One, however is serializable, while the other is not. One contains two methods that the other does not. Otherwise each contain string properties that are, indeed, all the same.
VB.Net will not let me assign one to the other either directly or through TryCast without either a widening or narrowing conversion. I admit to not understanding what I should actually do in this conversion, so I am asking for some guidance. Here are my two properties:
First - the serializable one...

Public Class PanelInfo
    <XmlElement("sourceowner")> Public Property SourceOwner As New String(String.Empty)
    <XmlElement("locationname")> Public Property LocationName As New String(String.Empty)
    <XmlElement("description")> Public Property Description As New String(String.Empty)
    <XmlElement("secondarydescription")> Public Property SecondaryDescription As New String(String.Empty)
    <XmlElement("misc")> Public Property Misc As New String(String.Empty)
    <XmlElement("geolocation")> Public Property Geolocation As New GeolocationInfo_Type
    <XmlElement("copyright")> Public Property Copyright As New String(String.Empty)
 
    Private _CameraType As New String("unknown")
    <XmlElement("cameratype")> Public Property CameraType As String
        Get
            Return _CameraType
        End Get
        Set(value As String)
            Select Case value.ToLower
                Case "ptz"
                    _CameraType = value
                Case "fixed"
                    _CameraType = value
                Case "unknown"
                    _CameraType = value
                Case Else
                    _CameraType = "unknown"
                    Throw New Exception("Only 'ptz', 'fixed' or 'unknown' are valid camera types")
            End Select
        End Set
    End Property
    Public Function XML() As String
        Using ser As New Serialization.Serializer
            Return ser.Obj2XML(Me, GetType(PanelInfo))
        End Using
    End Function
 
    Public Sub LoadXML(XML As String)
        Using ser As New Serialization.Serializer
            Dim This As PanelInfo = ser.XML2Obj(XML, GetType(PanelInfo))
            Me.SourceOwner = This.SourceOwner
            Me.LocationName = This.LocationName
            Me.Description = This.Description
            Me.SecondaryDescription = This.SecondaryDescription
            Me.Misc = This.Misc
            Me.Geolocation = This.Geolocation
            Me.Copyright = This.Copyright
            Me.CameraType = This.CameraType
        End Using
    End Sub
 
End Class
 
Public Class GeolocationInfo_Type
    <XmlAttribute("latitude")> Public Property Latitude As New String(String.Empty)
    <XmlAttribute("longitude")> Public Property Longitude As New String(String.Empty)
    <XmlAttribute("elevation")> Public Property Elevation As New String(String.Empty)
End Class
 

Now the non-serializable one (you can see it does not have the XML or LoadXML methods implemented - nor the serialization decorations)

Public Class PanelInfo
    Public Property SourceOwner As New String(String.Empty)
    Public Property LocationName As New String(String.Empty)
    Public Property Description As New String(String.Empty)
    Public Property SecondaryDescription As New String(String.Empty)
    Public Property Misc As New String(String.Empty)
    Public Property Geolocation As New Geolocation_Type
    Public Property Copyright As New String(String.Empty)
 
    Private _CameraType As New String("unknown")
    Public Property CameraType As String
        Get
            Return _CameraType
        End Get
        Set(value As String)
            Select Case value.ToLower
                Case "ptz"
                    _CameraType = value
                Case "fixed"
                    _CameraType = value
                Case "unknown"
                    _CameraType = value
                Case Else
                    _CameraType = "unknown"
                    Throw New Exception("Only 'ptz', 'fixed' or 'unknown' are valid camera types")
            End Select
        End Set
    End Property
 
    Public Function XML() As String
        Throw New NotImplementedException("Not Implemented - non serializable class")
    End Function
 
    Public Sub LoadXML(XML As String)
        Throw New NotImplementedException("Not Implemented - non serializable class")
    End Sub
 
End Class
 
Public Class Geolocation_Type
    Public Property Latitude As New String(String.Empty)
    Public Property Longitude As New String(String.Empty)
    Public Property Elevation As New String(String.Empty)
End Class
 

I can go through each of the properties and assign the values, but I would rather just pass one property to the other - but the IDE says I need a Widening Conversion if I pass it directly, or a Narrowing Conversion if I use TryCast. The IDE is helpful in that it offers to create the conversion for me, but it is pre-filled with a NotImplementedException - and I'm not clear on what I need to code inside this conversion...
Any help would be greatly appreciated.