This sample demonstrates how to display multiple lines in the cell. If you set the itemRenderer attribute to "TextAreaItem", then the carriage-return character (\n) will be replaced to the <br> tag.

You can set the variableRowHeight attribute to "true" so that when the cell height increases the grid row is resized to fit the cell height.

<DataGrid ... variableRowHeight="true" ... >
  <DataGridColumn dataField="desc" ... itemRenderer="TextAreaItem"/>

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