remove the background of static text

[Cooker]

As showing in attached picture, I want to remove the background of static text ("Quality : 100" and "Resoultion...").
The program I write is following:

// Print Prompt Text
         hwndStaticTextQuality = CreateWindowEx(0L, "STATIC", NULL, WS_CHILD | WS_VISIBLE | ES_LEFT , 
		      FrameX+5, FrameY, 80, 15, hwnd, (HMENU) ID_STATIC_LABEL_QUALITY, GetModuleHandle(NULL), 0 );
         sprintf(prompt_text,"Quality:%d",QUALITY_DEFAULT);
         SetWindowText(hwndStaticTextQuality, prompt_text);

         hwndStaticTextSpatial = CreateWindowEx(0L, "STATIC", NULL, WS_CHILD | WS_VISIBLE | ES_LEFT , 
		      FrameX+5, FrameY+36, 100, 15, hwnd, (HMENU) ID_STATIC_LABEL_SPATIAL, GetModuleHandle(NULL), 0 );

         sprintf(prompt_text,"Resolution:1/%d",SPATIAL_DEFAULT);
         SetWindowText(hwndStaticTextSpatial, prompt_text);

What should I modify?
Thank you.