diff --git "a/dll/win32/comctl32/comboex.c" "b/dll/win32/comctl32/comboex.c"
index 3c3714ac569..a6504223da8 100644
--- "a/dll/win32/comctl32/comboex.c"
+++ "b/dll/win32/comctl32/comboex.c"
@@ -1690,6 +1690,12 @@ COMBOEX_EditWndProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
             TRACE("erasing (%s)\n", wine_dbgstr_rect(&rect));
 	    ExtTextOutW (hDC, 0, 0, ETO_OPAQUE, &rect, 0, 0, 0);
             SetBkColor (hDC, obkc);
+#ifdef __REACTOS__ /* CORE-19407 */
+        ERR("ExStyle 0x%08x\n", GetWindowLongPtrW(infoPtr->hwndCombo, GWL_EXSTYLE));
+        ERR("Style 0x%08x\n", GetWindowLongPtrW(infoPtr->hwndCombo, GWL_STYLE));
+        /* set focus to the combobox */
+        SetFocus(infoPtr->hwndCombo);
+#endif
 	    return DefSubclassProc(hwnd, uMsg, wParam, lParam);
 
 	case WM_KEYDOWN: {