public ViewModelXamlMember(string propertyName, ViewModelXamlType <T> targetType, IXamlType propertyType)
{
_propertyName = propertyName;
_targetType = targetType;
_propertyType = propertyType;
}
public void RegisterViewModelType <T>(IXamlType baseType = null) where T : ViewModelBase, new ()
{
IXamlType xamlType = new ViewModelXamlType <T>(baseType);
AddType(typeof(T), xamlType);
}