I`m newbie in Mac OS X programming. Im trying to set columns number to one, but column delimeter in my interface is still there. How can i delete it ?

I`m newbie in Mac OS X programming. Im trying to set columns number to
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An IB Bug (I think) that has existed for a very long time. Just resize the Table View so that it’s smaller than the delimeter and then change it back to the original size you want.