No no, not just the Data Grid, this is why I didn't specify it at first because you'll think I just want to re-style the Data Grid. I specifically said that I'll be using this on ANY ui element and just gave the Data Grid as an example.
Are we on the same page here? Or do I have to create a presentation or even edit a video to relay what I need? I'm being serious, please tell me right now because it's been 48 hours already and we haven't even established what I really need.
For the last time, I'm asking for a similar function to DevExpress' to Clip Corner Radius.
What's a Clip Corner Radius? You simply add it into ANY ui element like a Grid, StackPanel, Border, Textbox, Button, etc like the implementation I posted above and it simply cuts out the corners visually depending on the double value you set on it (in the case of my example, it references to a double value I specified in my App.xaml with the resource key of "GeneralCornerRadius")