Provides class handling for the MouseLeftButtonDown event when the user presses the left mouse button while pausing the mouse pointer on the GridViewColumnHeader.
protected override void OnMouseLeftButtonDown(
The event data.
This implementation handles the MouseLeftButtonUp event so that the GridViewHeaderRowPresenter.OnMouseLeftButtonUp can support the drag-and-drop operation that moves a column. This method captures the mouse and sets the Handled event argument to true.