Make caption/border of child window transparent

lhyblue asked:

In my Win32 application, I want to create a child window within the main window. I assigned these styles to the child window when calling CreateWindowEx:

WS_CHILDWINDOW | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | WS_SIZEBOX | WS_CAPTION

The child window I get has a caption and a resizable border. However there's no close button in the caption, and the caption/border of the child window is not transparent. I'm using the aero theme in Windows 7.

Here is the screen shot:

How to add close button to the caption? How can I make the caption/border transparent?

What's more, you may not notice but initially the upper left and upper right corner of the child window has a black background. If I drag the window or resize it, the black background will disappear. Why is that and how to fix this minor problem?

Tags: C++, Win32, UI, Graphics

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