Create resizable window with fixed top coordinate
<p>I'd like to implemented a window that its top coordinate is always <em>X</em> (for simplicity let's say 0). Meaning, the window's top side is fixed on 0 which is the top of the screen. </p>

<p>I've already implemented the window, set its position using <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/ms633545(v=vs.85).aspx" rel="nofollow">SetWindowPos</a> but I'm struggling maintaining  its top coordinate value. </p>