I will address the listed issue following their original order:
1) Setting a DataTemplate with a TextBox that has its TextWrapping property to "Wrap" should do the trick. However, in order to make it work properly you will have to specify either Width, or MaxWidth value to it.
2) A possible approach would be to set RadPropertyGrid's LabelColumnWidth property to 0. Would you please test it in your scenario and let us know whether it is working for you?
3) The easiest way to accomplish this is to modify PropertyGridField's ControlTemplate in Expression Blend. Please, let us know in case you need some additional assistance with this.
the Telerik team
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