void dragFlapsForm_FormClosed(object sender, FormClosedEventArgs e)
 {
     if (dragFlapsForm != null)
     {
         dragFlapsForm.Dispose();
         dragFlapsForm = null;
     }
 }
 void liftFlapsForm_FormClosed(object sender, FormClosedEventArgs e)
 {
     if (liftFlapsForm != null)
     {
         liftFlapsForm.Dispose();
         liftFlapsForm = null;
     }
 }
 void sideDragForm_FormClosed(object sender, FormClosedEventArgs e)
 {
     if (sideDragForm != null)
     {
         sideDragForm.Dispose();
         sideDragForm = null;
     }
 }
 private void buttonDragFlaps_Click(object sender, EventArgs e)
 {
     if ((dragFlapsForm == null) && (modelControl != null))
     {
         dragFlapsForm = new CoefficientsForm(CoefficientsForm.CoefficientTypeEnum.DragFlaps);
         dragFlapsForm.ModelControl = modelControl;
         dragFlapsForm.FormClosed  += new FormClosedEventHandler(dragFlapsForm_FormClosed);
     }
     if (dragFlapsForm != null)
     {
         dragFlapsForm.Show();
         dragFlapsForm.BringToFront();
     }
 }
 private void buttonSideDrag_Click(object sender, EventArgs e)
 {
     if ((sideDragForm == null) && (modelControl != null))
     {
         sideDragForm = new CoefficientsForm(CoefficientsForm.CoefficientTypeEnum.SideDrag);
         sideDragForm.ModelControl = modelControl;
         sideDragForm.FormClosed  += new FormClosedEventHandler(sideDragForm_FormClosed);
     }
     if (sideDragForm != null)
     {
         sideDragForm.Show();
         sideDragForm.BringToFront();
     }
 }
 private void buttonLift_Click(object sender, EventArgs e)
 {
     if ((liftForm == null) && (modelControl != null))
     {
         liftForm = new CoefficientsForm(CoefficientsForm.CoefficientTypeEnum.Lift);
         liftForm.ModelControl = modelControl;
         liftForm.FormClosed  += new FormClosedEventHandler(liftForm_FormClosed);
     }
     if (liftForm != null)
     {
         liftForm.Show();
         liftForm.BringToFront();
     }
 }