draging issue.. why ? 2 more dimensions needed .. where ?

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hii
I have trouble trying to figure out why when i drag the body by any of the straight edges, i only get a 1 axis movement, be it vertical or horizontal, but not both at once..
however when i drag it by the circular surface, i can move the solid in whichever direction i want.. both axis simultaneously as wish .. why ? pls look at my attached video to understand what i meant.
2. this sketch keep saying needs 2 more dimension, but i just can't find what else dimension i am missing.. all are well labeled.
3. how am i suppose to "dock" the body at the origin datum ? right now although i have drag the item to dock at the origin, but, i still can drag it around..
thanks.
btw, forum doesn't allow me to attach a wmv file.. how you guys attach video file in the forum. ?
andrew