Check Menu item and toolbar button out of sync

I have a problem that I cannot solve. There must be something very 
simple that I am overlooking but I cannot find it.

I have a program with some menu entries (of course). Some of them are 
check items and one is replicated in a toolbar button that uses the same 
ID. I can mix menu clicks and toolbar button clicks and both elements 
stay in sync: if I check the menu item the button becomes pressed, for 
instance.

Now I added another check menu entry with a related toolbar button, 
again with the same ID. Both the menu entry and the toolbar button call 
the same event handler, as expected, but they are not in sync. If I 
check the menu item the toolbar butto does not become pressed and so on.

I have checked many times the code for these two commands and I can't 
see any difference, but this new one does not sync the UI elements.

Here is the code that creates the menu entries:

m_MenuView->Append(ID_VIEW_HOTSPOTS, _("Hotspots"), wxEmptyString, 
wxITEM_CHECK);

m_MenuView->Append(ID_VIEW_GRID, _("Grid"), wxEmptyString, wxITEM_CHECK);

and here is the code that creates the toolbar buttons:

wxBitmap 
itemtool30Bitmap(itemFrame1->GetBitmapResource(wxT("graphics/tlbHotspots.png")));
wxBitmap itemtool30BitmapDisabled;
m_Toolbar->AddTool(ID_VIEW_HOTSPOTS, _("Show Hotspots"), 
itemtool30Bitmap, itemtool30BitmapDisabled, wxITEM_CHECK, _("Show 
Hotspots"), wxEmptyString);

wxBitmap 
itemtool1Bitmap(itemFrame1->GetBitmapResource(wxT("graphics/tlbGrid16.png")));
wxBitmap itemtool1BitmapDisabled;
m_Toolbar->AddTool(ID_VIEW_GRID, _("Show Grid"), itemtool1Bitmap, 
itemtool1BitmapDisabled, wxITEM_CHECK, _("Show Grid"), wxEmptyString);

The "Show Hotspots" UI elements stay in sync, the "Show Grid" UI 
elements do not stay in sync.

I am building this un Windows.

Thanks in advance.

Fulvio Senore

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