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The DrawElementsType enum seems to be missing some members.
The Current values that is has are
public enum DrawElementsType
UnsignedByte = 5121,
UnsignedShort = 5123
From objective-C examples I know that at least one other value that is supported is UnsignedInt which can be found in the 'All' enum
public enum All
Byte = 5120,
UnsignedByte, // Would be 5121
UnsignedShort, // Would be 5123
UnsignedInt, // Would be 5125. GLEssentials Sample uses this
Fixed in master (702e2ee8).
From here: http://www.opengl.org/sdk/docs/man/xhtml/glDrawElements.xml it looks like UnsignedInt is the only missing member, so that was the only I added.