Tabstrip not adding Modal Dialog

[EricStiles]

I have a Modal Dialog called "Main".   In "Main" I have a TabStrip.  It has three tabs that I have added buttons and other stuff.  We will call them Tab1, Tab2, and Tab3.
I now realized that I'm going to need a 4th tab.   So in the properties of the Tab Strip I added a pipe and then text of Tab 4, so it now looks like the following "Tab 1|Tab 2|Tab 3|Tab 4" 
The visual tab strip now shows the 4th tab.  But in the "Project Pane" area it does not have a new Tab 4 under the Main Dialog.   
I don't remember how the first three got there, I think they just appeared for me automatically.  What do I have to do to get the 4th to appear so I can start adding buttons and stuff to it?

 

[EricStiles]

I found the answer.  Right click on the TabStrip and select properties.  Then pick on the tab that says "Tab/Pages"  Add your new Tab in here not on the Tab Captions.