PowerShell provider relative path tab-completion issue

I’m playing around with implementing a PowerShell Provider. After a while I started having big issues when using <tab> auto completion. Google wasn’t at much help, but I did find someone else who had the same problem. it just didn’t sound correct that it’s a “bug”, considering I have seen other providers that works correctly. Like notfed on Stack Overflow I tried returning different information, without any luck, so I finally decided to override all functions in NavigationCmdletProvider and do a Trace.WriteLine to see what was going on. And in MakePath I got lucky. To be honest since I haven't been able to find any source code examples that actually work, I don’t know if this is the correct solution, but it works for me, so I’m happy

''' <summary>
''' Joins two strings with a provider specific path separator.
''' </summary>
''' <param name="parent">The parent segment of a path to be joined with the child.</param>
''' <param name="child">The child segment of a path to be joined with the parent.</param>
''' <returns>A string that contains the parent and child segments of the path joined by a path separator.</returns>
''' <remarks></remarks>
Protected Overrides Function MakePath(parent As String, child As String) As String
	Trace.WriteLine("::MakePath(parent:=" & parent & ",child:=" & child & ")")
	Dim res As String = MyBase.MakePath(parent, child)
	Trace.WriteLine("::MakePath(parent:=" & parent & ",child:=" & child & ") " & res)
	If parent = "." Then
	    'res = ".\" & child.Split("\").Last
	    If String.IsNullOrEmpty(Me.SessionState.Path.CurrentLocation.ProviderPath) Then
		res = parent & PATH_SEPARATOR & child
	    Else
		res = parent & PATH_SEPARATOR & child.Substring(Me.SessionState.Path.CurrentLocation.ProviderPath.Length + 1)
		'res = parent & PATH_SEPARATOR & child.Replace(Me.SessionState.Path.CurrentLocation.ProviderPath & PATH_SEPARATOR, String.Empty)
	    End If
	    Trace.WriteLine("::**** TRANSFORM: " & res)
	End If
	Return res
End Function