private void TreeListOnShowingEditor(object sender, CancelEventArgs cancelEventArgs)
{
var fieldName = _treeList.FocusedColumn.FieldName;
var eventArgs = new CustomizeAppearanceEventArgs(fieldName, "ViewItem", new TreeListCancelEventArgsAppearanceAdapter(_treeList, cancelEventArgs), _treeList.FocusedObject, ViewInfo.FromView(View));
OnCustomizeAppearance(eventArgs);
}