hi guys, pretty new here but i've been using omnigraffle for sometime now.

i just don't know why i can not enter a specific length for my second line after joining it (connecting it) to my first line. my first line shows the width/height properties but my second line's width/height properties are grayed out. hence no way i can put the dimensions.

and i doing it right? any way of doing this?
i'm doing a floor plan which has specific lengths and i want to join all lines together.

help greatly appreciated.

tia