Missing using directive in TabPanel example

[tommiecc]

There is a missing using directive in the TabPanel example. When I was trying to implement the example this error was thrown:
error CS0246: The type or namespace name 'IControl' could not be found (are you missing a using directive or an assembly reference?)

The fix was to add using ConsoleGUI; to the TabPanel.cs file. I suggest that the example is updated unless it is an error that is solely on my machine for some reason.

[TomaszRewak]

Nicely spotted and thanks for reporting!
I've added the missing directive to the example.
Thanks!