HI All Contexters out there!

I'm a Guy from sweden who will appreciate a possible solution to 
following problem.

I'm interested in to do a personalized itemlist with a symbol created in 
metapost.

Here is an example:

\startuniqueMPgraphic{square}
draw roundedsquare(20,20,2) withrgbcolor (.625,0,0);
\stopuniqueMPgraphic

\defineoverlay[square][\uniqueMPgraphic{square}]

\setupitemgroup
     [itemize]
     [1]
     [symbol=square]

\starttext


\startitemize[1,columns]
\dorecurse{10}{\item itempoint \par}
\stopitemize

\stoptext

This doesn't have any effect so my question is how do I manage this?

I did following as an alternative solution and it worked as I wanted but 
If I run this example the linebreak comes in to the next column(third 
item), which is not what I want. See example below!

\definedescription
    [task]
    [text=\uniqueMPgraphic{square}, width=broad]

\startcolumns
\dorecurse{5}{\task very long sentence i will now write to create this 
weird issue \par}
\stopcolumns



How do I prevent this, or is there a better solution?

Many thanks in advance

Janneman