WPF Problem with selecting with pen

Question

I inserted InkCanvas in my WPF Window. When I start to erase with eraser on my pen, inkCanvas automatically changes editing mode to EraseByStroke. But when I use select with pen (button on the side) he can not figure that out and remains on Ink mode. Can I do this by my self (switching mode between Ink and Select) with some Event or something else?

Tnx in advance...