Rubberbanding problem under Multisampling mode!

I use the gl Logical operation XOR to draw a rubberband line on the front buffer. Recently I implemented multisampling method to render an outline text. The reason I use multisampling is to remove the aliase artifact of the outline text but the problem is my rubberband line can’t be showed now! Is it a conflict of drawing something to the front buffer and enable multisampling pixel format at the same time? Any help is appreciate!