BUG: SSTab Focus Given to a Control on a Non-Visible Tab

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Steps to Reproduce Behavior

1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.
2. Add a reference to the Microsoft Tabbed Dialog Control 5.0/6.0 by clicking Components from the Project Menu and checking "Microsoft Tabbed Dialog Control 5.0/6.0."
3. Add a Tabbed Dialog Control (SSTab1) to Form1. There will be three tabs: Tab0, Tab1, and Tab2.
4. Add a CommandButton to each tab on the SSTab1.
5. On the second tab, Tab 1, add the following code to the Click event of the CommandButton on this tab:

         SSTab1.Caption = "changed"
   
   					

6. Also on the second tab, set the Caption property of the CommandButton to "&Caption."
7. Run the project.
8. Click on the first tab, Tab 0, of the SSTab1 and hit the TAB key to move the focus to the CommandButton on Tab 0.
9. Now press the RIGHT ARROW key (->). Notice that no visible control has the focus.
10. Press the ENTER key. Notice the Tab 0 caption changes to "changed" showing that the middle tab's button was pressed.
11. Stop the project and run it again.
12. Click on the first tab, Tab 0, of the SSTab1 and hit the TAB key to move the focus to the CommandButton on Tab 0.
13. Press the ALT+C key combination. Note that the Tab 0 caption changes to "changed," showing that the middle tab's button was pressed.
    
    The Click event of the CommandButton fires in both cases, the ARROW key and the ACCESS key, even when the tab is not visible.