Registering a property in Egypt is called The Green Contract, and the Green Contract can only be applied for once the whole development has been completed and the land registered by the developer/builder/land owner. Once this has been done each individual purchaser should be given a Power of Attorney once they have paid all their payments, this POA gives them the right to register the property in their own name and get the Green Contract.
However, as with many "admin" procedures in Egypt, it is a very lengthy process (can take up to 2 years),and compared to some of the property prices, classed as expensive, with solicitor fees alone being up to £1000+ (due to the length of time it takes) and a payment to the government (it has recently changed and I think it is now 20le per m2).
This is one of the reasons many properties aren't registered, some owners probably don't even know about the process, one of the other reasons is once a property has been registered, it can't be registered by any new owner for 5 years, which can have an effect on resale as the new owner can't register it in their own name (many think the property can't be sold for 5 years after registering, but it is the re-registering that is the issue)
I would however recommend everyone registers their property as this is the only way to guarantee it is yours, especially with all the previous trouble of properties being double/triple sold)