[NTG-context] Typeset multiple pictures not in a strict matrix (\startfloatcombination)

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Hi,

I'm trying to typeset several pictures as a floatcombination but not in
the form of strict cells of a matrix.

Here is some ASCII art to demonstrate the positions of the pictures:

  ---------------------------
  |                         |
  |                         |
  ---------------------------
        a) Some caption

  ------------  -------------
  |          |  |           |
  |          |  |           |
  |          |  |           |
  ------------  -------------
     b) foo        c) foo

     Figure 1.1: Foo Bar


I tried to typeset it with this code (based on https://tex.stackexchange.com/a/502903):

\useMPlibrary[dum]
\setupcombinations[alternative=text]

\definefloat[subfigure][local=yes]
\setupcaption[subfigure][numberconversion=a]
\setuplabeltext[subfigure=]

\appendvalue{stopplacefigure}{\resetcounter[subfigure]}

\starttext
\startplacefigure[title=Test]
    \startfloatcombination[nx=1, ny=2]
      \startplacesubfigure[title=Test]
        \externalfigure[dummy][width=4cm,height=1cm]
      \stopplacesubfigure
      \startfloatcombination[nx=2, ny=1]
        \startplacesubfigure[title=Test]
          \externalfigure[dummy][width=4cm,height=1cm]
        \stopplacesubfigure
        \startplacesubfigure[title=Test]
          \externalfigure[dummy][width=4cm,height=1cm]
        \stopplacesubfigure
      \stopfloatcombination
    \stopfloatcombination
\stopplacefigure
\stoptext

However, this does not work (the pictures are all in one row).
Do you have some advice?

Gerion
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