RadGridView Header colors on hover

Hello, Paul,

You can use the following code snippet to change the hover color of the column headers in the grid using the SetThemeValueOverride method:

private void RadGridView1_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement is GridHeaderCellElement)
    {
        e.CellElement.SetThemeValueOverride(LightVisualElement.BackColorProperty, Color.LightGreen, "MouseOver");
        e.CellElement.SetThemeValueOverride(LightVisualElement.GradientStyleProperty, GradientStyles.Solid, "MouseOver");

    }
    else
    {
        e.CellElement.ResetThemeValueOverride(LightVisualElement.BackColorProperty, "MouseOver");
        e.CellElement.ResetThemeValueOverride(LightVisualElement.GradientStyleProperty, "MouseOver");
    }
}

I hope this helps. If you have other questions do not hesitate to contact me.

Regards,
Nadya
Progress Telerik

Hello, Paul,

I suppose that you have enabled sorting in RadGridView and you would like to manage the position of the up/down arrow. Please refer to the following forum thread that demonstrates how you can achieve this: https://www.telerik.com/forums/change-the-position-of-the-arrow-(sort)-in-the-header-of-the-grid#5174997 

According to your second question, note that RadGridView uses UI virtualization for its cells and rows. This means that the visible cells/rows are reused during scrolling, filtering, and other operations with the grid. This is why it is important to reset all of the applied customizations that you have made in the formatting events. More information is available here: 
https://docs.telerik.com/devtools/winforms/controls/gridview/fundamentals/ui-virtualization 
https://docs.telerik.com/devtools/winforms/controls/gridview/cells/formatting-cells 

I hope this helps. If you have other questions please let me know.

Regards,
Nadya
Progress Telerik