I am considering purchasing Omnigraffle, and I don't see the feature I'm interested in.

Say I have a diagram of blocks. If I click on a block, can it link to document where I could have notes or images stored? Maybe even links to iCal. Would the document links be part of the omnigraffle file, or a seperate application?

The Omnigraffle page makes it look simply like a beautiful flowchart. I'm looking for something that is the center of a project planning tool.

Thanks!