The problem I have is that I cannot find a way to deallocate the associated objects on shutting down the application.  I have tried placing the tidy-up code both in an override of OnRemoved and the destructor of my specialised combo but these fail because I cannot iterate through the list items due to the fact that the list box window no longer exists, causing GetCount to fail.

 

Is there another event I can use to do my combo box tidy-up?

for example clean all in OnDestroy. Also you can add some CArray variable, add items to this array and too the combo and delete in CArray in destruct.

 

You can also override CXTPControlComboBox and its OnRemove....

As I am converting many different types of toolbar to become command bars I was looking for the cleanest solution for tidying up specialised combo boxes.  For this reason I was hoping to avoid having to set up an additional CArray or CPtrList.  Also, as mentioned in my original post, overriding CXTPControlComboBox and its OnRemove doesn't work because, by that time, the window of the list box no longer exists (thus preventing iteration down it to delete the associated objects).

 

If I understand you correctly it seems the only option left is to go down the route of OnDestroy which I assume would require a specialised CXTPControlComboBoxList where this would be handled.