[MonoDevelop] Control behaviour at design time?

[Jeremy Morton]

I've noticed that controls seem to behave the same at design time in 
MonoDevelop as they do at runtime; for example, I can type text into a 
TextView.  Visual Studio controls have a DesignMode property that's true 
when a control is displaying in the designer, which allows controls to 
behave differently - often very useful, and surely desirable for almost 
every control (I don't want to type something into a textbox during 
design, I probably want to drag it around).  Does such a property exist 
for GTK# controls, and if not, wouldn't it be a good idea to introduce one?

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Best regards,
Jeremy Morton (Jez)