Hiding a button after a purchase with MKStoreKit

Been wrangling with MKStoreKit 3.0 for the first time... and nearly everything is good for me; things purchase, userdefaults are set, I've got UIbuttons that hide after reboots. But I seem to have tripped at a very elementary step.

How do I make my 'buy' UIbutton hide after purchases and re-purchases? Is there a function hidden in MKStoreManager.h that I'm yet to discover? Or should I just get the buyfeature action to twiddle its fingers for a whi开发者_运维技巧le then check to see if a purchase has happened in the intrim?

You can try to check [MKStoreManager isFeaturePurchased:featureID]. I'm not sure if this changed in MKStoreKit 4.0 though.