CorelDraw VBA CreateBlend Corner Detect

Hi Guys

Does anyone know if there a way of detecting the corners of a pathso that when you do a blend along path the corners are square

As you will se in the picture below the left corner is perfect but the right corner is off

The code im using to blend along the path is

Set eff = s2.CreateBlend(s1, Round(numstones), , , 0.5, , , sPath, True)

Any Ideas?