Drawing diagonal connector lines in Visio

I am now in need of creating some graphs and trees and have decided to use Microsoft's Visio for this purpose.

But the problem is that, by default, Visio's lines are set as Right-Angle Connectors and thus I couldn't create diagonal lines.

Anyways, to create diagonal connectors, just connect the line and then right click on it and change the routing to 'Straight Line' :