Hi zgulser,

that's exactly what I was looking for - it works now perfectly!

Qt Code:
  1. QFrame#frm_headerDlg {
  2. border-bottom: 1px solid #000000;
  3. border-top: 0px;
  4. border-right: 0px;
  5. border-left: 0px;
  6. }
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Many thanks for your hint!

beste regards
big4mil