I guess Allerleirauh find the answer!! Sometimes I can't name it primarily. I don't know why but I can change it when I double click the new item named "shape1". After some tests, I find a screwy rule. If I can't set the name primarily, even I name someone else instead of "shape1" after by double click the item, it will disappear after I reopen it. Is there anybody have the same problem? or just my system is not stable? Rino