HELP:Text size in ListView_SetItemText

[laserwave]

Hi,
I am calling ListView_SetItemText(), with text size as 500 bytes
ListView_SetItemText(HND, index, 5, buff);//buff = 500 bytes of data
But it is displaying only 260.
Howcome?
any mask or switch to set?
If i do ListView_SetColumnWidth with 500 pixel width, column width gets updated but still data not displayed more than 260 bytes.

Regards
Nikhil