Provides class handling for the MouseLeftButtonDown event when the user presses the left mouse button while pausing the mouse pointer on the GridViewColumnHeader.
Protected Overrides Sub OnMouseLeftButtonDown ( _
e As MouseButtonEventArgs _
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.