How to bind to a 2 dimensional array? (chessboard)

ok, here is a brief summery: the chessboard is a control, which consists of a grid with 8 columns and 8 rows (= 64 fields). In each of this grid-fields is another control, which i called Field. A field consists only of an image. ( the image with the figure, which stays on this field.) It also has a dependency property called FigureNumber.
If this number changes, i load the right image.

In the code behind of the chessboardcontrol, i have an 8x8 array (arrChessBoard) of ChessFigures (which are the figurenumbers, these are extended bytes: INotifypropertychanged, see code). What i now want: if i change byte (chessfigure) in this array, the right image should appear in the chessboardcontrol. I set the figurenumbers of the arrChessBoard in the contructor of the chessboardcontrol, but no figure is showed...

Here is my code:

the first of the 64 fields of the schachboardcontrol (i left out grid.row = 0 and grid.column = 0):

schach:field figurenumber="{Binding arrChessBoard[0][0], Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" removed="BurlyWood">

public class ChessFigure : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private byte _Value;
public byte Value
{
get { return _Value; }
set { _Value = value; OnPropertyChanged("Value"); }
}

void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
I dont know, why this does not function... There simply does not appear an image.
When i debug the program, i noticed, that the handler is always null and the event is never fired. But i dont know why;-)^^

thx for your time!