如果任何人的兴趣，我想我通过重写PerformDataBinding方法和捕捉ArgumentOutOfRangeException出现解决了这个。我怀疑SelectedValue属性可能需要重写，以及如果在两个属性绑定的顺序可能会有所不同。

If anyone's interested, I think I solved this by overriding the PerformDataBinding method and catching the ArgumentOutOfRangeException there. I suspect that the SelectedValue property might need to be overridden as well if the order in which the two properties are bound can vary.