Code

private void flow_ArrowCreated(object sender, ArrowEventArgs e)
{
Box bImm;

PointF center;

bImm = this.flow.CreateBox((r.Approssima(e.Arrow).X-19),(r.Approssima(e.Arrow).Y-24),38,48);

bImm.Style = BoxStyle.Shape;
bImm.Shape = myshape;
bImm.Image = Image.FromFile(@"D:/Prototipi/Designer/test2/Association/MyBox/MyBox/home.ico");
bImm.ImageAlign = ImageAlign.Fit;
bImm.Text  ="transazione";
bImm.Locked = false;
bImm.Font = new Font("Arial",10,System.Drawing.GraphicsUnit.World);
bImm.AttachTo(e.Arrow,AttachToArrow.LongestHSegment,1);
bImm.Transparent = true;

}


public void insertBezierSegment(Arrow arrow, int segment,int index)
{
DialogResult mess = new DialogResult();

int pos = index;

if (arrow.Style != ArrowStyle.Bezier)
mess = MessageBox.Show("Non hai disegnato una curva di bezier!","Errore");

if (segment > arrow.SegmentCount)
mess = MessageBox.Show("Invalid segment args","Errore");

PointCollection savedPoints = arrow.ControlPoints.Clone();

arrow.SegmentCount++;

//Approssima is a method who calculate Bezier Arrow' Middle point
PointF f = this.Approssima(arrow);

// restore the points of the old segments
for (int i = 0; i < segment * 4; ++i)
arrow.ControlPoints[i] = savedPoints[i];
for (int i = (segment + 1) * 4; i < arrow.ControlPoints.Count; ++i)
arrow.ControlPoints[i] = savedPoints[i - 3];

arrow.ControlPoints[pos] = f;
}