Unfortunately the RadTabControl
has limited design-time support at the moment and this is why in the VS Designer you can't add new TabItem
from the context menu. But you can add new RadTabItems
from the context menu of the RadTabControl
in Expression Blend.
For the moment in VisualStudio
you can create the new RadTabItems
either by declaratively defining them in xaml
or by dragging them from the ToolBox
However, as the design-time support of the control definitely need to be improved, I logged a feature request in our PITS
where you can vote for the item in order to increase its priority.
the Telerik team
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