Getting Started
In order to define a contextual action for horizon histogram layers, you need to put your Python script in your Python directory under a directory called Contextual_Histogram_Horizon_Layer.
Go to Tools->Options->Environment->Python Scripts (or Tools->Options->Python->Scripts in INTViewer 5.2) and click "Refresh from Disk". Your script should be listed automatically.
You will now be able to execute this script from the contextual menu of the horizon histogram layer:
This script will change the selected attribute of the histogram to the next attribute of the horizon data.
This script is attached to the bottom of this article.
The result after the script executes should look something like the following.