diff --git a/include/wx/window.h b/include/wx/window.h
index 20e8ec5119..92cd592644 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -1514,6 +1514,12 @@ public:
     // Returns true if more idle time is requested.
     virtual bool SendIdleEvents(wxIdleEvent& event);
 
+    // Send wxContextMenuEvent and return true if it was processed.
+    //
+    // Note that the event may end up being sent to a different window, if this
+    // window is part of a composite control.
+    bool WXSendContextMenuEvent(const wxPoint& posInScreenCoords);
+
         // get the handle of the window for the underlying window system: this
         // is only used for wxWin itself or for user code which wants to call
         // platform-specific APIs
diff --git a/samples/grid/griddemo.cpp b/samples/grid/griddemo.cpp
index bc68dae5dc..df7810c7d6 100644
--- a/samples/grid/griddemo.cpp
+++ b/samples/grid/griddemo.cpp
@@ -614,6 +614,8 @@ GridFrame::GridFrame()
     grid->SetAttr(11, 11, new wxGridCellAttr);
     grid->SetAttr(11, 11, NULL);
 
+    grid->Bind(wxEVT_CONTEXT_MENU, &GridFrame::OnGridContextMenu, this, grid->GetId());
+
     wxBoxSizer *topSizer = new wxBoxSizer( wxVERTICAL );
     topSizer->Add( grid,
                    1,
@@ -797,6 +799,23 @@ void GridFrame::SetTabCustomHandler(wxCommandEvent&)
     grid->Bind(wxEVT_GRID_TABBING, &GridFrame::OnGridCustomTab, this);
 }
 
+void GridFrame::OnGridContextMenu(wxContextMenuEvent& event)
+{
+    // This is not supposed to happen: even if the grid consists of different
+    // subwindows internally, all context menu events should be seen as coming
+    // from the grid itself.
+    if ( event.GetEventObject() != grid )
+    {
+        wxLogError("Context menu unexpectedly sent from non-grid window.");
+    }
+    else
+    {
+        wxLogMessage("wxEVT_CONTEXT_MENU in the grid at at (%d, %d)",
+                     event.GetPosition().x, event.GetPosition().y);
+    }
+
+    event.Skip();
+}
 
 void GridFrame::ToggleGridLines( wxCommandEvent& WXUNUSED(ev) )
 {
diff --git a/samples/grid/griddemo.h b/samples/grid/griddemo.h
index 9c7ab3e8f3..a80c366b7b 100644
--- a/samples/grid/griddemo.h
+++ b/samples/grid/griddemo.h
@@ -122,6 +122,8 @@ class GridFrame : public wxFrame
 
     void OnGridCustomTab(wxGridEvent& event);
 
+    void OnGridContextMenu(wxContextMenuEvent& event);
+
 public:
     GridFrame();
     ~GridFrame();
diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 9d0ef0a1b8..0b744892fd 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -3069,6 +3069,20 @@ wxWindowBase::DoGetPopupMenuSelectionFromUser(wxMenu& menu, int x, int y)
 
 #endif // wxUSE_MENUS
 
+bool wxWindowBase::WXSendContextMenuEvent(const wxPoint& posInScreenCoords)
+{
+    // When the mouse click happens in a subwindow of a composite control,
+    // the user-visible event should seem to originate from the main window
+    // and, notably, use its ID and not the (usually auto-generated and so
+    // not very useful) ID of the subwindow.
+    wxWindow* const mainWin = GetMainWindowOfCompositeControl();
+
+    wxContextMenuEvent
+        evtCtx(wxEVT_CONTEXT_MENU, mainWin->GetId(), posInScreenCoords);
+    evtCtx.SetEventObject(mainWin);
+    return mainWin->HandleWindowEvent(evtCtx);
+}
+
 // methods for drawing the sizers in a visible way: this is currently only
 // enabled for "full debug" builds with wxDEBUG_LEVEL==2 as it doesn't work
 // that well and also because we don't want to leave it enabled in default
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index c211ece237..ee6e7db6d6 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -1706,12 +1706,8 @@ gtk_window_button_press_callback( GtkWidget* WXUNUSED_IN_GTK3(widget),
         // (a) it's a command event and so is propagated to the parent
         // (b) under some ports it can be generated from kbd too
         // (c) it uses screen coords (because of (a))
-        wxContextMenuEvent evtCtx(
-            wxEVT_CONTEXT_MENU,
-            win->GetId(),
-            win->ClientToScreen(event.GetPosition()));
-        evtCtx.SetEventObject(win);
-        return win->GTKProcessEvent(evtCtx);
+        const wxPoint pos = win->ClientToScreen(event.GetPosition());
+        return win->WXSendContextMenuEvent(pos);
     }
 
     return FALSE;
diff --git a/src/gtk1/window.cpp b/src/gtk1/window.cpp
index fdc2e37a2c..98224b25fb 100644
--- a/src/gtk1/window.cpp
+++ b/src/gtk1/window.cpp
@@ -1629,12 +1629,8 @@ static gint gtk_window_button_press_callback( GtkWidget *widget,
         // (a) it's a command event and so is propagated to the parent
         // (b) under some ports it can be generated from kbd too
         // (c) it uses screen coords (because of (a))
-        wxContextMenuEvent evtCtx(
-            wxEVT_CONTEXT_MENU,
-            win->GetId(),
-            win->ClientToScreen(event.GetPosition()));
-        evtCtx.SetEventObject(win);
-        return win->HandleWindowEvent(evtCtx);
+        const wxPoint pos = win->ClientToScreen(event.GetPosition());
+        return win->WXSendContextMenuEvent(pos);
     }
 
     return FALSE;
diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index 23c965885c..957b185bd7 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -3636,8 +3636,6 @@ wxWindowMSW::MSWHandleMessage(WXLRESULT *result,
                 // the event may be handled by a parent window
                 wxPoint pt(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
 
-                wxContextMenuEvent evtCtx(wxEVT_CONTEXT_MENU, GetId(), pt);
-
                 // we could have got an event from our child, reflect it back
                 // to it if this is the case
                 wxWindowMSW *win = NULL;
@@ -3650,8 +3648,7 @@ wxWindowMSW::MSWHandleMessage(WXLRESULT *result,
                 if ( !win )
                     win = this;
 
-                evtCtx.SetEventObject(win);
-                processed = win->HandleWindowEvent(evtCtx);
+                processed = win->WXSendContextMenuEvent(pt);
 
                 if ( !processed )
                 {
diff --git a/src/osx/window_osx.cpp b/src/osx/window_osx.cpp
index f3c4260ac7..51686ffd13 100644
--- a/src/osx/window_osx.cpp
+++ b/src/osx/window_osx.cpp
@@ -2338,20 +2338,7 @@ void wxWindowMac::OnMouseEvent( wxMouseEvent &event )
 {
     if ( event.GetEventType() == wxEVT_RIGHT_DOWN )
     {
-        // copied from wxGTK : CS
-        // VZ: shouldn't we move this to base class then?
-
-        // generate a "context menu" event: this is similar to wxEVT_RIGHT_DOWN
-        // except that:
-        //
-        // (a) it's a command event and so is propagated to the parent
-        // (b) under MSW it can be generated from kbd too
-        // (c) it uses screen coords (because of (a))
-        wxContextMenuEvent evtCtx(wxEVT_CONTEXT_MENU,
-                                  this->GetId(),
-                                  this->ClientToScreen(event.GetPosition()));
-        evtCtx.SetEventObject(this);
-        if ( ! HandleWindowEvent(evtCtx) )
+        if ( !WXSendContextMenuEvent(ClientToScreen(event.GetPosition())) )
             event.Skip() ;
     }
     else
diff --git a/src/qt/window.cpp b/src/qt/window.cpp
index 7a31b7a928..5e1ac194ef 100644
--- a/src/qt/window.cpp
+++ b/src/qt/window.cpp
@@ -1619,15 +1619,11 @@ bool wxWindowQt::QtHandleCloseEvent ( QWidget *handler, QCloseEvent *WXUNUSED( e
 
 bool wxWindowQt::QtHandleContextMenuEvent ( QWidget *WXUNUSED( handler ), QContextMenuEvent *event )
 {
-    wxContextMenuEvent e( wxEVT_CONTEXT_MENU, GetId() );
-    e.SetPosition(
+    const wxPoint pos =
         event->reason() == QContextMenuEvent::Keyboard
             ? wxDefaultPosition
-            : wxQtConvertPoint( event->globalPos() )
-    );
-    e.SetEventObject(this);
-
-    return ProcessWindowEvent( e );
+            : wxQtConvertPoint( event->globalPos() );
+    return WXSendContextMenuEvent(pos);
 }
 
 bool wxWindowQt::QtHandleFocusEvent ( QWidget *WXUNUSED( handler ), QFocusEvent *event )