diff --git a/samples/propgrid/propgrid.cpp b/samples/propgrid/propgrid.cpp
index b21d978911..07e6aa943c 100644
--- a/samples/propgrid/propgrid.cpp
+++ b/samples/propgrid/propgrid.cpp
@@ -1162,7 +1162,7 @@ void FormMain::PopulateWithStandardItems ()
 
     for ( it = pg->GetGrid()->GetIterator();
           !it.AtEnd();
-          it++ )
+          ++it )
     {
         wxPGProperty* p = *it;
         if ( p->IsCategory() )
@@ -2370,7 +2370,7 @@ void FormMain::OnIterate1Click( wxCommandEvent& WXUNUSED(event) )
     for ( it = m_pPropGridManager->GetCurrentPage()->
             GetIterator();
           !it.AtEnd();
-          it++ )
+          ++it )
     {
         wxPGProperty* p = *it;
         int res = IterateMessage( p );
@@ -2387,7 +2387,7 @@ void FormMain::OnIterate2Click( wxCommandEvent& WXUNUSED(event) )
     for ( it = m_pPropGridManager->GetCurrentPage()->
             GetIterator( wxPG_ITERATE_VISIBLE );
           !it.AtEnd();
-          it++ )
+          ++it )
     {
         wxPGProperty* p = *it;
 
@@ -2424,7 +2424,7 @@ void FormMain::OnIterate4Click( wxCommandEvent& WXUNUSED(event) )
     for ( it = m_pPropGridManager->GetCurrentPage()->
             GetIterator( wxPG_ITERATE_CATEGORIES );
           !it.AtEnd();
-          it++ )
+          ++it )
     {
         wxPGProperty* p = *it;
 
diff --git a/samples/propgrid/tests.cpp b/samples/propgrid/tests.cpp
index 07e539d172..044dc46bfc 100644
--- a/samples/propgrid/tests.cpp
+++ b/samples/propgrid/tests.cpp
@@ -296,7 +296,7 @@ wxArrayPGProperty GetPropertiesInRandomOrder( wxPropertyGridInterface* props, in
 
     for ( it = props->GetIterator(iterationFlags);
           !it.AtEnd();
-          it++ )
+          ++it )
     {
         wxPGProperty* p = *it;
         size_t randomNumber = rand();
@@ -440,7 +440,7 @@ bool FormMain::RunTests( bool fullTest, bool interactive )
 
             for ( it = page->GetIterator(wxPG_ITERATE_VISIBLE);
                   !it.AtEnd();
-                  it++ )
+                  ++it )
             {
                 wxPGProperty* p = *it;
                 RT_MSG(p->GetLabel());
@@ -962,7 +962,7 @@ bool FormMain::RunTests( bool fullTest, bool interactive )
 
             for ( it = page->GetIterator( wxPG_ITERATE_CATEGORIES );
                   !it.AtEnd();
-                  it++ )
+                  ++it )
             {
                 wxPGProperty* p = *it;
 
@@ -1003,7 +1003,7 @@ bool FormMain::RunTests( bool fullTest, bool interactive )
 
             for ( it = page->GetIterator( wxPG_ITERATE_CATEGORIES );
                   !it.AtEnd();
-                  it++ )
+                  ++it )
             {
                 wxPGProperty* p = *it;
 
@@ -1053,7 +1053,7 @@ bool FormMain::RunTests( bool fullTest, bool interactive )
 
             for ( it = page->GetIterator( wxPG_ITERATE_CATEGORIES );
                   !it.AtEnd();
-                  it++ )
+                  ++it )
             {
                 arr.Add((void*)*it);
             }