Thank you for writing.
You should set the column's WrapText and Multiline properties. In addition, you need to make sure that the cell is large enough to fit the entire text. Here is an example:
GridViewTextBoxColumn = TryCast(radGridView1.Columns(
col.HeaderTextAlignment = ContentAlignment.TopLeft
"Column Multiline Very long 2"
col.Width = 100
radGridView1.TableElement.TableHeaderHeight = 36
I hope this will be useful. Let me know if you have additional questions.
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