Disable drill down on group header

Hello everybody,

How can I disable drill down on group header. I have an on-demand subreport and a group inside the subreport. On the group header, I am showing group number and a text field. On the subreport, group header appears to be a hyperlink and when someone clicks on the group header hyperlink, the page blows up.

Any ideas how can I resovle this? I simply need to disable the hyperlink (drill down) but I don't need to suppress the group header since I need to show the text.

Thanks.