Click the following button to experiment with the API:
 

Obtains the WebTabObject using ISGetObject(). You can use this function to retrieve any other IntersoftComponents objects.
Obtains the active tab in WebTab.
Set ActiveTab to Tab named "IFrame". The Tab will move to the "IFrame" Tab
Disable Tab named "InlineContent". The Tab will become disabled.
Enable Tab named "InlineContent". The Tab will become enabled.
Change "InlineContent" Tab's Caption Text
Change the Image for "IFrame" Tab
Change ContentURL for "IFrame" Tab

To learn more object model and API available in WebTab, refer to WebDesktop.NET Documentation >> Client Side Reference >> Class Library