negative numbers in a edit box

I have a edit box in a modal dialog box. It needs to accept negative numbers tho it wont let you use the " - " key. How can I reverse this behaviour? also if I want it to keep the number negative if it is to begin with what should I set bsigned to?(TRUE or FALSE?)

Well I dunno if there's a simpler way, but you'd just have to take off the option for making it a number-only boxy (it slips my mind what it is...ES_NUMBER?) then every time the stuff in the edit box changes, parse what comes through to make sure it's not anything but '-' or '.' like...

Code:

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for(x=0;buff[x]=='\0';x++)
{
      if(isdigit(buff[x]) || buff[x] == '-' || buff[x] == '.')
            continue; //keep going, this one's OK.
      else
      {
              buff[x] = ' ';
              SetWindowText(hEdit, buff); //or SetDlgItemText()
              //you could put a break here, becuase anything else should have been flushed out already
      }
}

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Using SetDlgItemInt() and need signed, set bSigned=TRUE;