Here is a short video demonstrating how to add the AVWindow Objective-C class to an AppleScriptObjC project. The AVWindow class can be found in the tutorial "Adding a Titlebar Accessory View to a Window" by Matt Patenaude
Integrating Objective-C code into an AppleScriptObjC application is incredibly easy. In this example, I use an Objective-C helper class to retrieve the NSRange of the selected text in an NSTextField. If you have any questions about the code, post them in the comments.
Update I have created four five new tutorials to help people get started with the new AppleScriptObjC framework.
Just posted an article at MacScripter.net on using AppleScriptObjC in Xcode. This is the first of several articles to help people get started using the new framework.
Part 3 of AppleScriptObjC in Xcode has now been posted. This tutorial covers modifying and creating custom Xcode templates.
If you use Xcode very much this is a real time saver!
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Selected Range of NSTextField (