Because I'd like to show only the image itself (no Non-Client-Area) i'm using the `WS_POPUP` style for the created window.
But there is apparently sth. wrong with the window - when i move the mouse over the app window i get "loading/busy" (animating blue circle). Moreover i cant' move the window. When i change the style to for example `WS_CAPTION` all is OK - the mouse cursor is "normal" (just arrow as usually) and i can move/drag the window. How can i use the `WS_POPUP` style without this bizarre side effects I've described?