Reorder the x-axis using lattice

   Is there a way to reorder the xaxis using lattice. Using the 
following data, the x-axis is ordered as BP GH MH PF RE RP SF VT but
I would like the x-axis to be ordered as PF RP BP GH VT SF RE MH.

    K?n         Skalor     Tillf?lle Medelv?rde
1  Kvinnor     BP 1-inskrivning   36.45283
2  Kvinnor     GH 1-inskrivning   38.62255
3  Kvinnor     MH 1-inskrivning   62.88889
4  Kvinnor     PF 1-inskrivning   39.80710

  bwplot(Medelv?rde ~ Skalor| K?n , kt, panel = "panel.superpose",
       groups = Tillf?lle,scales = list(x = list(rot = 45),cex=0.7,
alternating=2),
...

Dear list,

5  Kvinnor     RE 1-inskrivning   41.50943
6  Kvinnor     RP 1-inskrivning   22.22222
7  Kvinnor     SF 1-inskrivning   59.19811
8  Kvinnor     VT 1-inskrivning   34.84568
9  Kvinnor     BP 2-utskrivning   43.14815
10 Kvinnor     GH 2-utskrivning   44.11321
11 Kvinnor     MH 2-utskrivning   77.22222
12 Kvinnor     PF 2-utskrivning   44.74280
13 Kvinnor     RE 2-utskrivning   68.95425
14 Kvinnor     RP 2-utskrivning   39.90385
15 Kvinnor     SF 2-utskrivning   64.62264
16 Kvinnor     VT 2-utskrivning   51.97531

       panel.groups = "panel.linejoin",lty=c(1:3),lwd=3,
col=c("steelblue","grey50","green4"),
       ylab = list(label = "skalpo?ng (0-100)", cex = 0.8),
       xlab = list(label = "skalor", cex = 0.8),
       key = list(lines = 
Rows(list(col=c("steelblue","grey50","green4"),lty=c(1:3)),
                c(1:3, 0)),cex=0.8,text = list(lab = as.
character(unique(kt$Tillf?lle))),
                  columns = 2, title = "SF-36: Skalpo?ng f?r 
respektive k?n vid 3 m?ttillf?lle ",
                  cex.title=0.9))

  Thanks in advance,
  Tom


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