void CheckboxTrainDefaultCheckedChanged(object sender, System.EventArgs e) {
if (checkboxTrainDefault.Checked) {
if (listviewTrainFolders.SelectedItems.Count == 1) {
listviewTrainFolders.SelectedItems[0].Selected = false;
}
if (listviewTrainRecently.SelectedItems.Count == 1) {
listviewTrainRecently.SelectedItems[0].Selected = false;
}
ShowDefaultTrain();
}
}