Large cell name

Hi,
i have header cells with a very large name, much more than the data they're showing and I need the text to show as large as it is. ActiveWidgets shows me ... instead, for example my headers are:

Nombre, NIF and Clientes y mediadores are my headers, and I need:

Nombre | NIF | Clientes y
| | mediadores

but with Active Widgets I get

Nombre| NIF | Clientes y...

Can I change this beheavour?
Thanks for your help in advance