Keep together crosstab column group

Hi,

I have a crosstab with two column groups: say A and B, the second of which has a variable number of items depending on the first column group value:

A1	A2	A3
B1.1   B1.2   B1.3	B2.1   B2.2   B2.3   B2.4   B2.5	B3.1   B3.2   B3.3   B3.4   B3.5   B3.6

Is there a way to keep together (in the same page) the columns belonging to the same outer group, so that, for example, if a page break occurs before B3.6, then all the A3-B3 columns are printed on the following page?

Thanks