[RESOLVED] [2005] Simple Threading Probloem

[MisterFuzyPants]

I'm trying to create a pretty easy threaded application but I keep getting an error message:

Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on.

I am aware that I should only alter the properties of a control from the thread in which it was created on, but I'm not altering the control directly from another thread. This is my current source:

Imports System.IO
Imports System.Threading
 
Public Class MainForm
 
    Private WithEvents _pdfMaker As PDFMaker
 
    Private Sub btnBrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBrowse.Click
        If (browseDialog.ShowDialog = Windows.Forms.DialogResult.OK) Then
            txtArchiveFilePath.Text = browseDialog.FileName
        End If
    End Sub
 
    Private Sub btnBurnFiles_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBurnFiles.Click
        _pdfMaker = New PDFMaker
 
        Dim mainThread As Thread = New Thread(AddressOf _pdfMaker.createPdfFromTiffArchive)
        _pdfMaker.ArchivePath = txtArchiveFilePath.Text
        _pdfMaker.TempDir = "C:\test\"
 
        mainThread.Start()
    End Sub
 
 
    Private Sub _pdfMaker_TiffAdded(ByVal percentDone As Double) Handles _pdfMaker.TiffAdded
        currentProgress.Value = percentDone
        txtStatus.Text = "Building PDF File (" & percentDone & "%)"
    End Sub
End Class

The error message is coming from currentProgress.Value = percentDone. currentProgress is an object of type toolStripProgressBar. For some reason though if i comment that line out the next line: txtStatus.Text = "Building PDF File (" & percentDone & "%)" does not trigger an error... any ideas?