[NTG-context] disabling reuse of figures

[Saji Njarackalazhikam Hameed]

Dear All,

It is a rather strange problem, I am compiling a presentation file using
ConText. I use the \startcombination enviroment to make a panel containing
4 plots. In the source file, I prescibe a different figure file (*.png)
for each page. ConText is however reusing the first set of figures so that
the panel in each page looks the same as in the first page. 
Is there a way to disable the "reusing of figures"?

A minimal example is reproduced below.

thanks for any suggestions.

saji

\input setups
\starttext

\startcombination[2*2]
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/GAUS/2007/6/Monthly/JUN/Global/prec.png]}
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/GAUS/2007/6/Monthly/JUN/Global/t850.png]}
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/GAUS/2007/6/Monthly/JUN/Global/z500.png]}
{\externalfigure[]}
\stopcombination

\page

\startcombination[2*2]
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/SCM/2007/6/Monthly/JUN/Global/prec.png]}
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/SCM/2007/6/Monthly/JUN/Global/t850.png]}
{\externalfigure[/apcc01/OPER/AFS/FIG/3-MON/MME_OUT/FORECAST/SCM/2007/6/Monthly/JUN/Global/z500.png]}
{\externalfigure[]}
\stopcombination

\stoptext