WHAT:Add custom cell rendering option for MultiColumnComboBoxColumn. Just like the 'cell' in GridColumnProps.
Hello, Grant,As the MultiColumnComboBox is an item selection-based component its render is for the entire row, not per cell as for the Grid. I can suggest using the itemRender prop to make modifications to the MultiColumnComboBox items:https://www.telerik.com/kendo-react-ui/components/dropdowns/api/MultiColumnComboBoxProps/#toc-itemrender
Even if visually it may seem that the MultiColumnComboBox is a ComboBox with a Grid inside of it, they are very different components.
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