Wrap-Around Porch - Getting the Roof to Wrap Correctly against a Gable Roofed Wall

[adkbri]

Would anyone know if there are instructions posted to create a wrap-around front porch when one side of the porch is against a gable roofed wall? The first image attached shows what happens when you set the porch wall (railing) to a gable roof. The second shows what happens when you set it to a hip roof. What I was looking for is more along the lines of the roof lines in the third image. The roof line is carried around the corner, directly against the side of the house (gable side) without connecting to the main structure roof.

Thank you for any help you can provide (I am using Home Designer Suite 2014).