Datagrid form - sorting?

[Malte Pfaff-Brill]

I have a datagrid form that has a timestamp in its dataArray. I would like to sort the data in the datagrid using that timestamp. 
For lists this is easy, but is it also possible for forms?

the data might look like this

tData[1]["timestamp"]
tData[1]["otherData"]
tData[2]["timestamp"]
tData[2]["otherData"]

Thanks in advance,

Malte