Clear change log to prevent from undo/redo. - commit the transaction after changing DOM-tree. - prevent SPObject document from adding changes into the log of undo/redo. - If a changes is not in the log of undo/redo, it would not be redo.

<LEFT>		Turn to left.
<RIGHT>		Turn to right.
<UP>		Turn to up.
<DOWN>		Turn to down.
<SPACE>		To Fire.