WPF – TabControl
Adding new TabItem
Currently, you can add new TabItems only by adding them in the XAML Panel
Changing Active tab during the design
During the design, you may want to view different tabs of the TabControl
You can achieve this by changing the SelectedIndex property, either in the
properties, XAML, or data context panel
For example, setting SelectdIndex to a number 1 will switch to the second tab item