problem with ContourPlot of discrete values (ExplicitLevels)

Hi all,

I have a plot problem concerning the ContourPlot Resources
'cnLevelSelectionMode'.
As you can see in the picutere (screenshot of wks_type = "ps"), I want to
have a contour plot of landuse data (integers). The problem is that somehow
a 30th value called 'Label_29' colored dark-grey is added to the labelbar
of the contourplot. That does not happen at the histogram-plot but though
this additional value, the data become shifted one position, wherefore the
histogram does not fit to the contourplot.
These are the resources for the contourplot:

  res_clc@cnFillOn = True ; turn on
color
  res_clc@cnFillMode = "RasterFill" ; much faster
to plot high res data
  res_clc@cnLinesOn = False ; no contour
lines
  res_clc@cnLineLabelsOn = False ; no line labels
  res_clc@tmXBLabelStride = 1
  res_clc@lbLabelAlignment = "BoxCenters"
  res_clc@lbLabelStrings = clc_classes
  res_clc@lbLabelAngleF = 65
  res_clc@lbLabelFontHeightF = 0.015
  res_clc@cnLevelSelectionMode = "ExplicitLevels" ; set manual
contour levels
  res_clc@cnLevels = clc_classes
  res_clc@cnFillColors = clc_colors

with

  clc_classes =
(/111,112,121,122,123,124,131,132,133,141,142,211,221,222,231,242,243,311,312,313,321,322,324,331,411,412,423,511,512/)
; n = 29
  clc_colors = (/"green", "purple", "brown", "SlateBlue", "orangered",
"blue", "palevioletred", "olivedrab2", \
             "wheat", "OliveDrab","darkgreen", "skyblue2", "yellow", "red",
"green", \
             "HotPink", "brown", "Blue", "LightGrey", "MediumTurquoise",
"purple" , \
           "DarkSeaGreen", "Peru", "Tomato", "blue", "green", "orange",
"orchid", "red"/) ; n = 29

and

  plot(0) = gsn_csm_contour(wks,data_clc(::-1,:),res_clc) ; 2d
  plot(1) = gsn_histogram(wks,data_1d_clc,res_clc_hist) ; same data with
ndtooned() for this resource I use:
res_clc_hist@gsnHistogramDiscreteBinValues = clc_classes and
res_clc_hist@gsFillColor = clc_colors

I found out that 'Label_29' only appears when I use "BoxCenters" as
lblabelAlignment. If I use the default value for this resource, a 30th
color apperas but without the label 'Label_29'

Does anyone know how to fix this problem of plotting increasing values with
irregular gaps like 'clc_classes' ?
Thanks for any advice
Wish you a nice summer,
Chris

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