In GridTreeControl, the column header displays the header text and sort icon when you sort the column. You can customize the column header like adding the image by using QueryCellInfo event.
You can load image or any content in column header by handling QueryCellInfo event and changing the CellType to DataBoundTemplate. Using DataBoundTemplate cell type, you can load any content by assigning template to CellTemplate or CellTemplateKey property.
You can also hide the border of the header by handling QueryCellInfo event as below,
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