Advanced User Interface Controls and Components
Sets the index of a column which cells will contain the expand box in the Grid.
An Integer value. The default is 0, stating that cells in the first column of the Grid will contain the expand box.
This property is accessed through 'expanding-column-index' attribute of Grid directive.
Supported in: v2.1.
A demonstration on how to set which column will show cells with expand box in Tree Grid directive for AngularJS.