To add a tab folder with sheets on a form, first drag tab folder to the form and then as many sheets as you want to the folder. Alternatively you can run the VL_BASETAB template (choose the Templates command on the Design tab of the ribbon) to create a tab folder with four sheets.
Tab sheets have a run-time property Opened, which indicates whether it is currently the topmost tab in the folder and two related events: Opening and Closing. Opening event is triggered when the user has clicked on a tab sheet to bring it to front, and Closing is triggered when another tab is being opened.
