Declaration
TIEUpdateParamsOp = (
iepuNone,
iepuInsert, // Index: Inserted Image
iepuDelete, // Index: Deleted Image
iepuMove, // Index: Moved Image, ParamEx: Destination position
iepuSwap, // Index: Image 1, ParamEx: Image 2
iepuMoveGroup, // Index: Selected Image, ParamEx: Before Image Index. Note: Full selection is not exposed
iepuClear, // No params
iepuAllocate // ParamEx: Allocate count (Virtual images only)
);