[Dr. Geo] Style of points (to control lines) in DrGeo

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In the following the points are named and drawn in a style as little dots 
(small circles) :
 
| sketch a b c d A B C D BD AC E F S |

sketch _ DrGeoSketch new.
a _ -1@0.
b _ 2@2.
c _ 4@0.
d _ 1@-2.
sketch text: 'Overstaande hoeken' at:-2@2.
A _ sketch point:a.
B _ sketch point:b.
C _ sketch point:c.
D _ sketch point:d.
AC _ sketch line: A to: C.
BD _ sketch line: B to: D.
S _ sketch intersectionOf: AC and: BD.
S name:'S'.
E _ sketch angle: C  to:S  to: B.
F _ sketch angle: A  to:S  to: D.


I've noticed that if I draw a line interactively in the 
DrGeoSmalltalkSketchEditor it draws points as little 'x' crosses.

Is this a style that can be controlled please for drawing points ?

Thanks,
David Stes