Shapes with solid dash type not selectable

This may be old news, but I'm having a problem with using rectangular shapes as buttons when the dash type is solid.  

I created a number of shapes (rectangles, no fill, dashed line) over sections of the interface for a piece of equipment.  After setting them up and adding triggers I decided that the shapes weren't prominent enough so I changed the dash type to solid and increased the pixel size.  When I did this, I could no longer select the enter shape...I could only select it's online.  When I change the dash type back to a dashed (broken) line, I could select the entire area of the shape.  

Is this a problem (known or otherwise) or is it designed to work this way?

Thanks for any input.

Jay