private void initBoard()
{
_board = new Element[20][];
x = new VertexPositionTexture[sizeX][][];
for (int i = 0; i < sizeX; i++) {
x[i] = new VertexPositionTexture[sizeY][];
_board[i] = new Element[20];
for (int j = 0; j < sizeY; j++) {
x[i][j] = new VertexPositionTexture[4];
}
}
}