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sap.m.RadioButton has got only Text attribute and does not have a Value attribute.
While I can work around this by using custom data, is there anything I am missing? sap.ui.commons.RadioButton has got a key field.
Also, what is good way to bind a value to a Radio Button Group(with sap.m.Radiobutton controls) in XML View
The "selected" property of sap.m.RadioButton is what you are looking for. Documentation