//Use this function to make a new one with cbSize already filled in.
//For example:
//var WndClss = WNDCLASSEX.Build()
public static WNDCLASSEX Build()
{
var nw = new WNDCLASSEX();
nw.cbSize = Marshal.SizeOf(typeof(WNDCLASSEX));
return(nw);
}
public static extern short RegisterClassEx([In] ref WNDCLASSEX lpwcx);