Create Window with WS_EX_LAYERED

When create an window with WS_EX_LAYERED style, an Window shown invisible.
Maybe window's alpha blend value is 0.
I wonder that it's bug or normal.

It can be shown correcting an alpha blend value.

CLayeredWindow* LW = new CLayeredWindow;
LW->CreateEx(WS_EX_LAYERED, _T("Layered"), 0, WS_CHILD WS_POPUP

WS_CLIPCHILDREN

WS_CLIPSIBLINGS


WS_THICKFRAME,

rect, this, 0,0);
LW->ShowWindow(SW_SHOW);
LW->SetLayeredWindowAttributes(0, 100, LWA_ALPHA);