void
JXChooseFileDialog::UpdateDisplay()
{
    JXCSFDialogBase::UpdateDisplay();

    JXDirTable* dirTable = GetFileBrowser();
    if (dirTable->HasFocus() && !dirTable->HasSelection())
    {
        itsOpenButton->Deactivate();
    }
    else
    {
        itsOpenButton->Activate();
    }
}