Question crsystal report help

[me_only]

hi every one
i am developing a program using vb.net and oracle as database.
i need some help in crystal report
i have to build a report that open another report ; the two reports read the data from the same tables.
it's a same document but have a following document; i need to have a way to open the following document when the parent document was shown.
if any one have any idea about this issue .
thanks for your time .