} // SelectedColumns
private void SettingsEditorModeMultiColumn_Load(object sender, EventArgs e)
{
ItemsManager = new ListItemsManager <UiBroadcastListColumn>(listSelectedColumns, buttonRemove, buttonMoveUp, buttonMoveDown);
comboColumns.DataSource = ColumnsList.AsReadOnly();
buttonAddColumn.Enabled = (comboColumns.Items.Count > 0);
ItemsManager.SetValueDictionary(ColumnsList, null);
ItemsManager.Add(Columns);
} // SettingsEditorModeMultiColumn_Load
