Enabling Horizontal Scroll for Group Header in RadGridView

Environment

Product	RadGridView for WPF
Version	2024.3.924

Description

How to enable horizontal scrolling in the group header row of RadGridView for WPF.

Solution

By default the GroupHeaderRow element doesn't scroll horizontally. To allow this, you can set the SelectiveScrollingGrid.SelectiveScrollingOrientation attached property on one of the visual children of the row.

You can do this by modifying the GroupHeaderRow's ControlTemplate or programmatically through the RowLoaded event. Basically, you need to find the ToggleButton element with x:Name="HeaderButton" and set the attached property on it.

The following example shows how to use the RowLoaded event.

private void gridView_RowLoaded(object sender, Telerik.Windows.Controls.GridView.RowLoadedEventArgs e) 
{ 
    if (e.Row is GroupHeaderRow) 
    { 
        var button = e.Row.ChildrenOfType<ToggleButton>() 
            .FirstOrDefault(x => Telerik.Windows.Controls.GridView.SelectiveScrollingGrid.GetSelectiveScrollingOrientation(x) == SelectiveScrollingOrientation.Vertical);          
        Telerik.Windows.Controls.GridView.SelectiveScrollingGrid.SetSelectiveScrollingOrientation(button, SelectiveScrollingOrientation.Both); 
        Telerik.Windows.Controls.GridView.SelectiveScrollingGrid.SetSelectiveScrollingClip(button, true); 
    } 
}