/// <summary>
///
/// </summary>
/// <param name="column"></param>
public void Remove(Column column)
{
if (column == null)
return;
column.PropertyChanged -= ColumnObserver;
Verbose("Remove Column: " + column.Id);
}
/// <summary>
///
/// </summary>
/// <param name="column"></param>
public void Add(Column column)
{
if (column == null)
return;
column.PropertyChanged += ColumnObserver;
Verbose("Add Column: " + column.Id);
}