public void Shuffle()
{
var points = new Point[]{
new Point(0, 0),
new Point(1, 0),
new Point(2, 0),
new Point(0, 1),
new Point(1, 1),
new Point(2, 1),
new Point(0, 2),
new Point(1, 2),
new Point(2, 2)
};
points.Shuffle ();
for ( int i = 0; i < 9; i++ ) {
Items[ i ].Location = points[ i ];
}
CauseUpdate ();
}