The RadTabItem class is the default item of the RadTabControl. The TabItem appears in the TabStrip of the TabControl while the contents of its Content property are shown when the Tab is selected.

When tabs are inserted into the TabControl the last Tab to have its IsSelected property set to true would be selected.

You can change the look of the Control by setting the Theme, Style or Control Template properties. To change the look of all the TabItems in a TabControl, use the ItemContainerStyle and ItemContainerStyleSelector

The RadTabItem is not meant to be used on its own but as item of the RadTabControl. The TabItems will be automatically created if other items are inserted in the RadTabControl.

The properties of the TabItem that affect the TabControl are:IsBreak property governs whether the next TabItems will be in a separate row.IsSelected property selects or deselects the given item (shows and hides its content in the TabControl)Content is the Content that is displayed in the content area of the TabControl when the item is selected.ContentTemplate is the ContentTemplate of the TabControl content area when the item is selected.

Please note that the TabStripPlacement and TabOrientation properties are set by the TabControl and as such are read-only.