There is way to use mouse to do RectangleZoom.

1. unbind the default response of your left button in your actual controller, just like this:

this.View.ActualController.UnbindMouseDown(OxyMouseButton.Left);

2. bind the RectangleZoom command to this controller:

this.View.ActualController.BindMouseDown(OxyMouseButton.Left, PlotCommands.ZoomRectangle);

that's all.

sorry for my poor English, I'm from Chinese ;)

if there's still any problem, you can contract me with my wechat:S592063

Joey