Here's a potential approach:
<StringVectorProperty name="ChooseOne"
command="SetChosenOne">
<StringListDomain name="list">
<RequiredProperties>
<Property function="StringList"
name="AvailableOptionsInfo" />
</RequiredProperties>
</StringListDomain>
</StringVectorProperty>
<StringVectorProperty name="AvailableOptionsInfo"
information_only="1"
command="GetAvailableOptions"
si_class="vtkSIDataArrayProperty">
</StringVectorProperty>
With the following method prototypes:
void SetChosenOne(const char*);
vtkStringArray* GetAvailableOptions();
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