If you want to expand the row when the mouse is over the + button, then you can use GridView's PreviewMouseMove event. Then you can find the underling element, verify it is GridViewToggleButton and expand the row details. Please check the following code snippet for a reference:
private void clubsGrid_PreviewMouseMove(object sender, MouseEventArgs e)
var element = e.OriginalSource as FrameworkElement;
var toggleButton = element.ParentOfType<
if (toggleButton != null)
var row = toggleButton.ParentOfType<
if (row != null)
row.DetailsVisibility = Visibility.Visible;
I hope tihs helps.
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