Marshalling Struct with array of Structs inside it

[chijazz]

I have the following unmanaged code:

typedef struct sicCrdPgInfo {
short bProg;
short wAA1Limit;
short bFree;
short wPad3;
BYTE ucPCB[8];
} tsicCrdPgInfo;

typedef struct sicCrdInfo {
short wPgCnt;
short wCrdSz;
long lCardType;
BYTE ucCSN[8];
} tsicCrdInfo;

To marshal to managed code I have the following:

[StructLayout(LayoutKind.Sequential)]
public class tsicCrdPgInfo
{
public short bProg;
public short wAA1Limit;
public short bFree;
public short wPad3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=8)]
public byte[] ucPCB;
}

[StructLayout(LayoutKind.Sequential)]
public class tsicCrdInfo
{
public short wPgCnt;
public short wCrdSz;
public long lCardType;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=8)]
public byte[] ucCSN;
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex=8)]
public tsicCrdPgInfo[] CPI;
}

It screws up with that last CPI field. How do I get it to correctly
marshal an array of a struct within another struct? (sounds like a
tongue twister)

Any help would be appreciated.