The ShapedForm seems to suffer from a few problems:
1. The Shape doesn't honor the Bottom/Top Left/Right Rounded properties at all. No matter what those properties are set to, I always get rounded corners. The attached screenshot should have the top left and bottom left corner rounded only, but shows all corners rounded.
2. When using a border, it is cut off on the right top and right bottom corner (see screenshots). Depending on the border width, it is missing completely.
3. Even when the title bar is removed, the dialog can be moved by the mouse. While this is a handy feature, it also means that double-clicking on the top area of the shaped form will maximize the form and that's definitively not wanted.
Can we expect to have those bugs fixed in the near future since they severely limit the usability of this shaped form.
It simply doesn't look good that way and I'd rather resort to have a form background image with transparency key.