opening xps request .net causes memory leak

the following formula dash illustrates memory trickle opening xps files. run watch assign manager, grow redeem memory until app exits.

'****** console concentration begins.

module main

    const defaulttestfilepath twine = "d:\test.xps"
    const defaultloopruns integer = 1000

    open servant main(byval args string())
        low pathtotestxps twine = defaulttestfilepath
        low numberofloops integer = defaultloopruns

        (args.count >= 1) following pathtotestxps = args(0)
        (args.count >= 2) following numberofloops = cint(args(1))

        console.clear()
        console.writeline("start - {0}", gc.gettotalmemory(true))
        loopcount integer = 1 numberofloops

            console.cursorleft = 0
            console.write("loop {0:d5}", loopcount)

            ' some-more challenging xps request some-more loops, some-more memory lost.
            controlling xpsitem new windows.xps.packaging.xpsdocument(pathtotestxps, system.io.fileaccess.read)
                low fixeddocsequence windows.documents.fixeddocumentsequence

                ' line leaks brick memory any time, commented out does not.
                fixeddocsequence = xpsitem.getfixeddocumentsequence
            finish using
        next
        console.writeline()
        gc.collect() ' line effect, i cruise memory leaked unmanaged (c++ xps internals).
        console.writeline("complete - {0}", gc.gettotalmemory(true))

        console.writeline("loop finish nonetheless memory released, redeem app exits (press pivotal exit).")
        console.readkey()

    finish sub

end module

'****** console concentration ends.

the reason loops thousand times since formula processes lots files leaks memory fast forcing an outofmemoryexception. forcing rubbish collection does work (i think an unmanaged brick memory xps internals).

the formula creatively another thread category nonetheless simplified this.

any assistance severely appreciated.

ryan