Expand/Collapse all in a report

Hello.

Is there a built in option of adding an Expand/Collapse all Button to my report?

I have a report with few groups and I want to give the user a simple way to expand all of them for easy view or collapse all of them so he can see only the groups header.

I thought about using an expression in the hidden property of the groups and try to control it with parameters but its looks like a lot of work.

Is there something "of the self" for it?

Thank.
Roy.I thought about starting to build some button for this thing but I predict problem with it if I'll try to sort the table and the page will refresh it self every time.

Did any body tried this before?

Thanks|||

Allo Roy

I've done something similar:
I have a report with a BUNCH of measures, all hidden and you can display them
one by one and then it also displays a chart "dynamically" with a "button" corresponding to
the specific measure.

Add a new text box within the scope of the table, call it toggle...
then select the column and in the properties set the :
Visibility Toggle Item to the name of the textbox.

The textbox at runtime will then have a little plus that
will toggle the visibility.

The same is possible for rows and subtotals
although I haven't gotten a way to do it with Matrix's.

If i'm unclear or understand you wrong, please point it out

Peace
G