Assembly: PresentationFramework (in PresentationFramework.dll)
This implementation handles the MouseLeftButtonUp event (which occurs when the Handled property in the MouseEventArgs is set to true). It also ends the mouse capture that was set by the OnMouseLeftButtonDown method. This provides a way for the GridViewHeaderRowPresenter.OnMouseLeftButtonUp to support the drag-and-drop operation that moves a column.
This method sets the Handled event argument to true.