thanks tony for your reply.
i removed AcceptMouseUpAsPoint in the UserInputControls,but still doesn't work.
while from keyboard input cordinate of a point in the format of "x,y,z" ,i could find that the dres.status(return value of prompts.AcquirePoint()) is PromptStatus.Ok,but dres.value can not get the keyboard-input value. So.something will be created at the place where the cursor stayed at that time,but not the place what keyboard-input point defined.
another truth is , i have another custom class derived from EntityJig,and in the Sampler override ,i also used AcquirePoint method which is completely the same as that one of DrawJig,from UserInputControls setting to the method make use of dres.value. but here,the user input from keyboard works well.
does that the difference of DrawJig and EntityJig ?
anyone has encountered the same problem?pls. help me