FormBorderStyle None for MDI child

An MDI child with FormBorderStyle set to None will still draw borders briefly when loading.
A microsoft report on this bug: connect.microsoft.com

If you do your own skinning this creates a very unprofessional look.

I solved it by overloading WndProc and handling WM_NCACTIVATE, WM_NCPAINT, WM_NCUAHDRAWCAPTION and WM_NCUAHDRAWFRAME manually.

I'll post some code later if someone is interested.