This is a Merged class / mod, that includes Robinton's Mods' CreativeItemAdding and 4096_BlockIDs, and the afp.class portion of CreativeAPI_1.0.0 (from http://www.minecraftforum.net/topic/705840-100-creative-api/). This should also be compatible with any creative APIs that don't modify ContainerCreative.java (afp.class).

Robinton's Mods' CreativeItemAdding gives modders three function hooks that they can add to their ModLoader mods:
Object getCreativeBlocks();
Object getCreativeItems();
Object getCreativeDyes();
The Objects must be instances of ItemStack, Block, Item, or an array of any supported type, or else they will be ignored. They will be added to the Creative Item-Selection GUI after standard blocks, items, and dyes, depending on which function they are returned by.