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Due to a limitation in RadRichTextBox, it is not possible to detect when the mouse pointer is over the column border. We are aware of this limitation and we will try to improve this in future.
In case you might find resizing a column programmatically useful, you can use the following method to achieve this:
sender, EventArgs e)
TableCellLayoutBox box = radRichTextBox1.Document.CaretPosition.GetCurrentTableCellBox();
TableCell cell = box.AssociatedTableCell;
TableRow row = cell.Row;
Table table = row.Table;
More information on managing tables in RadRichTextBox can be found here
Let me know if you have any other questions.
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