Changing the Tree Expander Icon Column
You can configure the column where the tree node expander icon is displayed by specifying either the column index or the column name.
Loading RealGrid...
// Column index where the expander icon should be displayed
treeView.treeOptions.expanderColumn = 2;
// Or specify the column name to display the expander icon in a specific column
treeView.treeOptions.expanderColumn = "colName";