PropertyGrid: CheckBoxList Property

Build a CheckBoxList Property Type

public class CheckBoxList : INotifyPropertyChanged
{
	private dynamic _values;
	private dynamic selectedItem;
	public event PropertyChangedEventHandler PropertyChanged;
	public event PropertyValueChangedEventHandler PropertyValueChanged;
 
	public CheckBoxList(String name, PropertyGrid pg)
	{
		PropertyName = name;
		PG = pg;
	}
 
	private String PropertyName { get; set; }
	private PropertyGrid PG { get; set; }
 
	public dynamic Values
	{
		get
		{
			return _values;
		}
		set
		{
			if (value != null)
			_values = value;
		}
	}
 
	public string ValueMember { get; set; }
	public string DisplayMember { get; set; }
 
	[Browsable(false)]
	public dynamic SelectedItem
	{
		get
		{
			return selectedItem;
		}
		set
		{
			String oldValue = selectedItem;
			selectedItem = value;
	
			if (PropertyChanged != null)
				PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
 
			if (PG != null)
			{
				if (PropertyValueChanged != null)
					PropertyValueChanged(this, new PropertyValueChangedEventArgs(PG.SelectedGridItem, oldValue));
			}
		}
	}
 
	public override string ToString()
	{
		return SelectedItem;
	}
}