Can't say I've ever heard of uFrame, and it's a terrible name for a data binding framework if it's truly all it does.
You can modify your local copy of 3.5.6 to put NGUI's PropertyBinding into its own namespace if you like. You will just need to clarify which property binding is used like so:
using PropertyBinding = CustomNamespace.PropertyBinding;
...assuming "CustomNamespace" is what you called the namespace. The line above will need to be placed in the following 3 files:
* NGUIContextMenu.cs
* NGUIHelp.cs
* PropertyBindingEditor.cs