Changing variable from int to double

I am using an .ocx MS Chart, and in that there is an attribute .rowcount (MSChart1.rowcount) that is declared as an int. However, my data is more than an int can hold (32000?), so i would like to be able for .rowcount to be able to hold a number larger than this so I can graph all of my data. I have tried redimming it as a double or even CDbl, but that does not seem to work. Can anyone help me on making the variable a double since it is inside the .ocx or get around this? or can anyone tell me how to add rows to my graph?