diff --git a/lcl/interfaces/qt/qtwidgets.pas b/lcl/interfaces/qt/qtwidgets.pas
index a35b628ae8..375adb7eb0 100644
--- a/lcl/interfaces/qt/qtwidgets.pas
+++ b/lcl/interfaces/qt/qtwidgets.pas
@@ -9787,6 +9787,8 @@ begin
   begin
     Result := TQtComboBox(LCLObject.Handle).InUpdate or
       (csDesigning in LCLObject.ComponentState);
+    if (QEvent_type(Event) = QEventPaint) and (csDesigning in LCLObject.ComponentState) then
+      QObject_event(Sender, Event);
     if Result then
       QEvent_ignore(Event)
     else
diff --git a/lcl/interfaces/qt5/qtwidgets.pas b/lcl/interfaces/qt5/qtwidgets.pas
index f3838fcfcd..bb25da0069 100644
--- a/lcl/interfaces/qt5/qtwidgets.pas
+++ b/lcl/interfaces/qt5/qtwidgets.pas
@@ -9695,6 +9695,8 @@ begin
   begin
     Result := TQtComboBox(LCLObject.Handle).InUpdate or
       (csDesigning in LCLObject.ComponentState);
+    if (QEvent_type(Event) = QEventPaint) and (csDesigning in LCLObject.ComponentState) then
+      QObject_event(Sender, Event);
     if Result then
       QEvent_ignore(Event)
     else