Modifies XAML compilation behavior, such that fields for named object references are defined with public access rather than the private default behavior.
x:Name attribute must also be provided on the same element.
The value for the x:FieldModifier attribute will vary by programming language. The string to use will depend on how each language implements its CodeDomProvider and the type converters it returns to define the meanings for TypeAttributes.Public and TypeAttributes.NotPublic. For C#, Microsoft Visual Basic or Visual C++ component extensions (C++/CX), you can give the string value "public" or "Public"; the parser doesn't enforce case on this attribute value.
You can also specify NonPublic (internal in C# or C++/CX, Friend in Visual Basic) but this is uncommon. Internal access doesn't have any application to the Windows Runtime XAML code generation model. Private access is the default.
x:FieldModifier is only relevant for elements with an x:Name attribute, because that name is used to reference the field once it is public.