A column in an HierarchicalTreeDataGridSource<TModel> whose cells show an expander to reveal nested data.
public class HierarchicalExpanderColumn<TModel> : NotifyingBase, IExpanderColumn<TModel>, IColumn<TModel>, IUpdateColumnLayout, IColumn, INotifyPropertyChanged where TModel : class
kind:method, kind:property, kind:ctor. Press Esc to clear.ActualWidthGets or sets the actual width of the column after measurement.TagGets or sets a user-defined object attached to the column.