Icons in TreeView

My TreView shows icons with black background.
I made background transparent, it looks transparent in Windows Explorer and I want it to be transparent in my TreeView. This is the code:

  g_himl = ImageList_Create(16, 16, ILC_COLOR4, 1, 1);
  hicon = LoadIcon(g_hInst, MAKEINTRESOURCE(ICO_MyComp));
  iMyComp = ImageList_AddIcon(g_himl, hicon);
  DeleteObject(hicon);
  TreeView_SetImageList(g_hwndTree, g_himl, VSIL_NORMAL);
shvetsovAsked:
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makerpCommented:
image_list.Create(13,13,ILC_COLOR4|ILC_MASK,3,1);
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