Automatic detection and implementation of modifications to an application are described. A new base model of the application is generated using the edited version of the application. This base model is simulated to a selected state, resulting in a new presentation model that includes a tree of multiple objects described by the new base model at the selected state, and a pointer for each node of the tree that points back to the associated node in the new base model. The pointers of each node of the new presentation model are compared to the nodes of the previous presentation model of the application and then replaced with those corresponding nodes in the previous presentation model when the nodes are equivalent. Otherwise, the nodes of the new presentation model are maintained.