Write alv column as bold

Hi,

I have created an alv. Now, I need to write some fields (columns) with color orange (subtotal) and with bold style.

I have used the Emphasize field from the fieldcat in this way:

wa_fieldcat-emphasize = 'C310'.

C: color

3: orange

1: bold (1:on/ 0:off)

0: inverse (1:on/ 0:off)

The result is: i get the orange color in the desired columns, but I don´t get the bold style...

Any ideas because this doesn´t works?

Thanks in advance,

Carles