public virtual Task<Boolean> ArrangeAsync (
    Diagram diagram,
    DiagramItemCollection items,
    double dx = 0,
    double dy = 0
)

Public Overridable Function ArrangeAsync( _
    diagram As Diagram, _
    items As DiagramItemCollection, _
    Optional dx As Double = 0, _
    Optional dy As Double = 0 _
) As Task(Of Boolean)