Making Matrix clips from midi loops

[hhal9000]

I'm trying to make a midi matrix clip in Cakewalk that is slightly shorter than 2 bars.It needs to be this lenghth for the loop to repeat without a pause.However when I drag this  midi loop into the Matrix and then play it back there, it seems to default to playing to the full 2 bar lenghth which does not work musically.Is there a way of having a matrix midi clip at a lenghth other than an exact bar?

thanks