Customizing Small Frame in Aero - VSB

Hi, I'm trying to customize the small windows that some programs use. Ex. this is the find/replace window in Notepad++:




Left is the Basic theme and the images are at:
Windows and Caption Buttons > Basic >
SmallCaption
SmallFrameLeft
SmallFrameRight
SmallFrameBottom


Right is the Aero theme, with “Enable transparent glass” and “Show shadows under windows” unchecked in the Windows’ System properties >Advance > Performance options. I can’t find where these images are located, so any help will be greatly appreciated. Also, help me to locate that ugly close button in the Basic theme please. My display/screen resolution options are at Medium – 125% if that helps. Thanks!

Thanks Jerry, I tried all your suggestions but none of them are the frame of the window:



What I'm looking for is the frame (or border) of these small windows, aero, shadowless:



But thank you so much for the info about the close button, I could finally change it.

Thanks a lot Jerry! The frame I was looking for is the Tool Window (bottom, left, right and top).

Now I'm going to learn about the the mess that Aero really is because I realize that there are a bunch of layers upon layers (reflections, shadows and who knows what else) before you can even see the frame of the window. But that will be another thread if I get stuck. Thanks again!