The style property defines the style with which the widget is displayed.
To retrieve the style of another widget, the standard widget reference syntax is used within the Style formula:
#widgetName
or (if the widget is on another page):
#pageName.widgetName
The left button "My Button" retrieves its style from the right button "buttonStyle". If the style of the right button changes, the style of the left button is changed as well.
If the content of the left cell is "available", it uses the style of the widget with name "availableStyle". If not, the style of the reservedStyle widget is used.