Styling the MultiWindowElement

[SandTechStuff]

I want to decrease the corner radius for the taskbar program buttons, which is easily doable with CornerRadius=2, but I cannot figure out how to apply it to the MultiWindowElement. Without applying it to both, it looks inconsistent.

Actual button has corner radius of 2, while MultiWindowElement does not follow.

It seems CornerRadius does have an effect on the MultiWindowElement, but it does not seem consistent with the program buttons.

MultiWindowElement with CornerRadius=0, the bottom of it is not rounded, yet the top still is. Difficult to see in this screenshot, as snipping tool cut it off.

Is there any known way to make the MultiWindowElement behave like a normal element, or is there a different style to modify its corner radius? It seems almost hard-coded to be the shape that it is, and is unlike anything I have seen in taskbar styling.

[SandTechStuff]

I may have worded my post wrong as I figured out how to style the MultiWindowElement before this, sorry about that. My question was if there is a way to make the MultiWindowElement behave more like a standard element.

For example, in one of the images above I set CornerRadius=0 on the MultiWindowsElement. The bottom of the MultiWindowElement follows this, and has no radius, while the top of it still has a rounded corner. A normal element would have no rounded corners on all sides, which is what I mean when I say “behave like a standard element”.

Setting CornerRadius to values larger than default seems to work fine, as you demonstrated in your image. Values smaller, however, seem to be finicky as stated in the example above.