I am making pretty simple custom control which only combines several other default controls together with some custom logic.
Errors from INotifyDataError interfaces are not displaying on my
control.
As far as I can see the common practice to display validation errors on
custom control is to implement several visual states on it and switch
them when receiving bound data.
But to be honest I hate to work with this stuff and whole UI part.
Is there a way to display default rectangular invalid state around
the square content? For example it would be great to inherit from such
control or to use it as the content presenter with switchable states.
Does Telerik provides something that can be used as a base for validatable control?