Bytamin_c.com has a board that specializes in BCB. You could try there.
In general I would look for a push_back() or an insert() or an add() method within the class. STL vector class uses the push_back() method for routine use and insert() for special occassions.
Code:
struct car
{
int numWheels;
int speed;
};
#include "car.h" //depending how you set it up
#include "TISArrayAsVector.h"
int main()
{
TISArrayAsVector <car> cars;
car temp;
temp.numWheels = 4;
temp.speed = 55;
cars.push_back(temp);//or as appropriate based on interface
//etc.