[NTG-context] Problems with columns and grid

Hello list,

in the following minimal working example (using Mark IV), the \column
command is ignored. It works if the grid is disabled or balance=no is
set. I need the grid, and regarding the balance: without balance, the
columns use the whole type area height, but I want additional text to
appear underneath the columns. The height parameter doesn't seem to
control the columns' height. So my question is: How can I make \column to
work or how can I at least set the column height as a workaround?

\setuplayout[grid=yes]
\starttext
\startcolumns%[balance=no]
left
\column
right 1\\right 2
\stopcolumns
\stoptext

Kind regards,
Joshua

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