At design time you can't change the style of the cells in the grid. In order to customize the grid cells, it is suitable to handle the CellFormatting
event and apply the desired style for the cells. Please refer to the following help article: https://docs.telerik.com/devtools/winforms/gridview/cells/formatting-cells
Alternatively, you can customize the theme that you are using in your application via Visual Style Builder
and change the color for the selected state of the cell elements
You can read more details about using the Visual Style Builder here:
1. Loading predefined themes
2. Working with Repository Items
3. Saving and Loading Theme Files
4. Loading Themes from an External File
5. Loading Themes from a Resource
6. Applying Theme to a Control
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
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