public void Remove(ExplorerBarItem item)
{
if (item != null && m_items.Contains(item))
{
Controls.Remove(item);
m_items.Remove(item);
item.Collapsed -= HandleItemExpandingOrCollapsing;
item.Expanded -= HandleItemExpandingOrCollapsing;
item.SizeChanged -= item_SizeChanged;
ManageVScrollBar();
}
}