In the post above it is not clear. I am trying to ask why TAdvMDITabSet and TAdvOfficeMDITabSet are different from the normal TAdvTabSet and TAdvOfficeTabSet?
TAdvMDITabSet & TAdvOfficeMDITabSet are designed to work with MDI child windows and tabs are directly related to the MDI child windows, i.e. when a MDI child is added, there is a tab added and from the tabs, MDI childs can be activated & removed for example. Did you check the TAdvOfficeMDITabSet demo for example?