If you want to change the appearance of the DocumentRuler control, you could change its style. The default is 'DocumentRulerBaseStyle
'. More information about how to create custom style basing on an existing one and how to apply a theme using implicit styles, you could read in this help article
If you desire to change the behavior of the ruler, you could create a controller by implementing the IDocumentRulerController
interface and setting that controller on the DocumentRuler through its Controller
I hope this helps.
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