private void listViewMarkCollections_SelectedIndexChanged(object sender, EventArgs e)
{
if (_updatingListContents)
return;
if (listViewMarkCollections.SelectedItems.Count > 0) {
PopulateFormWithMarkCollection(listViewMarkCollections.SelectedItems[0].Tag as MarkCollection);
} else {
PopulateFormWithMarkCollection(null);
}
buttonRemoveCollection.Enabled = (listViewMarkCollections.SelectedItems.Count > 0);
radioButtonTapper.Enabled = (listViewMarkCollections.SelectedItems.Count > 0);
radioButtonPlayback.Checked = true;
}