Custom side toolbar when using "Rhino for Windows" theme (WIP 5.2 - 5C185w)

On the Commands menu even when a custom “Copy of Default” is selected the left side toolbar that shows is the “Main” toolbar. When it is changed to the "Default"and back to “Copy of Default”, the customised toolbar defined on the “Copy of Default” finally appears and works. If the palette is changed by using the top ribbon bar, then the side toolbar is changed back to the side toolbar defined by “Default”. The “Copy of Default” is again ignored even though is shown in the menu as the one being used. One must change to “Default” and back again to “Copy of Default” to have the custom side toolbar active again.