public void RemoveColumn(IColumn column)
{
_columns.Remove(column);
RaisePropertyChanged("Columns");
ColumnsChanged.RaiseEvent(this,
new CollectionChangeEvent <IColumn>(CollectionChangeAction.Deletion, column));
}
public void AddColumn(IColumn column)
{
_columns.Add(column);
column.Parent = this;
column.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(column_PropertyChanged);
RaisePropertyChanged("Columns");
ColumnsChanged.RaiseEvent(this,
new CollectionChangeEvent <IColumn>(CollectionChangeAction.Addition, column));
}