I store the Nodes, Arrows as FlowRows and ControlPoints as FlowPointRows in a DataSet.

After recreating all nodes, i try to recreate the arrows and there ControlPoints by the following code:

For Each flowRow In GetFlowRows()

' Determine the sourceBox and drainBox of the arrow
' ...

Dim arrow As Arrow = Me.FlowChart.CreateArrow(sourceBox, flowRow.SourceAnchor, drainBox, flowRow.DrainAnchor)
Dim filter As String = String.Format("[Flow] = '{0}'", flowRow.FlowId)
Dim flowPointRows() As dsFmea.FlowPointRow = dsFmea.FlowPoint.Select(filter, "Index")

arrow.Tag = flowRow
arrow.OrgnAnchor = flowRow.SourceAnchor
arrow.DestAnchor = flowRow.DrainAnchor
arrow.Style = ArrowStyle.Cascading
arrow.SegmentCount = flowPointRows.Length - 1

For i As Int32 = arrow.ControlPoints.Count To flowPointRows.Length - 1
    arrow.ControlPoints(i) = New PointF(flowPointRows(i).LocationX, flowPointRows(i).LocationY)
Next

Next

Sometimes the ControlPoints collection size of an arrow is smaller than the count of stored points. Also the assignment of arrow.SegmentCount does not enlarge the collection. So i changed the loop to restore the points as follows:

For i As Int32 = 0 To Math.Min(arrow.ControlPoints.Count, flowPointRows.Length) - 1
    arrow.ControlPoints(i) = New PointF(flowPointRows(i).LocationX, flowPointRows(i).LocationY)
Next

For i As Int32 = arrow.ControlPoints.Count To flowPointRows.Length - 1
    arrow.ControlPoints.Add(New PointF(flowPointRows(i).LocationX, flowPointRows(i).LocationY))
Next

But after the user touched the origin or destination box of such an arrow the FlowChart throws an "Index out of range" Exception.
How can i fix this?

Thank You,
Oliver Petry