Button Corner Radius Click Area

[ivanjx]

Hi,

I have been using ControlsHelper.CornerRadius to make my button rounded like this:

However when I tried to click 'outside' the button, it is also registered as a click as if the button isnt rounded. Take a look at the image:

I can click the button within the red box. Also here is the video demonstration of it:

video.zip

Any way to just recognize the click inside the rounded button or is this the expected behaviour of ControlsHelper.CornerRadius with buttons? I have set my buttons style based on MahApps.Styles.Button.Flat globally.

Thanks.