[RESOLVED] Form remains visible after it has been unloaded

[krtxmrtz]

I have this code for a menu in my main form:

Private Sub mnuProcessData_Click()
    'Load a from where some math calculations
    'are performed on a large array of data
    frmDataProcess.Show 1
    'After the processing, the processed data
    'which were plotted on a picturebox must
    'be replotted as they have changed
    UpdateEverything
End Sub

In frmDataProcess is a 'Close' command button which unloads the form so control is returned to the main form and sub UpdateEverything which is fairly time-consuming takes over.
It works well, but after I click on 'Close', frmDatProcess remains visible for awhile, which I don't like. Any ideas to avoid this?