Define custom expand/collapse cell for the TreeList

Environment

Product Version	5.12.0
Product	Progress® KendoReact TreeList

Description

I want to define custom cell for the first column and I need the expand/collapse functionality

Solution

For achieving the desired result the custom cell should include logic for rendering the expand/collapse icon based on the props.dataItem.SUB_ITEM_FIELD length, props.expanded value and the level of the current cell. The level length is used for the empty space (based on the current level)

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