Public Overloads Overridable Sub AddControl( _
   ByVal control As Control _
) 

Dim instance As SheetView
Dim control As Control
 
instance.AddControl(control)

public virtual void AddControl( 
   Control control
)

public class SpreadTextBox : TextBox, FarPoint.Win.Spread.DrawingSpace.IEmbeddedControlSupport 
{ 
 private FarPoint.Win.Spread.DrawingSpace.Moving moving = Moving.None; 
 private FarPoint.Win.Spread.DrawingSpace.Sizing sizing = Sizing.None; 
 private FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy activation = ChildActivationPolicy.DoubleClick; 

 public virtual FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy ActivationPolicy { 
   get { 
     return activation; 
   } 
   set { 
   } 
 } 

 public virtual FarPoint.Win.Spread.DrawingSpace.Moving CanMove { 
   get { 
     return moving; 
   } 
   set { 
     moving = value; 
   } 
 } 

 public virtual FarPoint.Win.Spread.DrawingSpace.Sizing CanSize { 
   get { 
     return sizing; 
   } 
   set { 
     sizing = value; 
   } 
 } 

 public void ControlPaint(Graphics g, Rectangle r, FarPoint.Win.Spread.Appearance appearance, object value, bool isSelected,
bool isLocked, float zoomFactor) 
 { 
   g.SetClip(r, CombineMode.Intersect); 
   g.FillRectangle(new SolidBrush(this.BackColor), r); 
   g.DrawString(this.Text, Font, new SolidBrush(this.ForeColor), r.X, r.Y); 
   this.TextChanged += new EventHandler(MeTextChanged); 
 } 

 public void MeTextChanged(object sender, EventArgs e) 
 { 
   this.BackColor = Color.Beige; 
 } 
}

SpreadTextBox tb = new SpreadTextBox();
tb.Name = "TB";
fpSpread1.ActiveSheet.AddControl(tb);

Public Class SpreadTextBox
   Inherits TextBox
   Implements FarPoint.Win.Spread.DrawingSpace.IEmbeddedControlSupport

   Private moving As FarPoint.Win.Spread.DrawingSpace.Moving = Moving.None
   Private sizing As FarPoint.Win.Spread.DrawingSpace.Sizing = Sizing.None
   Private activation As FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy = ChildActivationPolicy.DoubleClick

   Public Overridable Property ActivationPolicy() As FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy Implements IEmbeddedControlSupport.ActivationPolicy
      Get
        Return activation
      End Get
      Set(ByVal Value As FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy)
           ' activation = Value
       End Set
   End Property

   Public Overridable Property CanMove() As FarPoint.Win.Spread.DrawingSpace.Moving Implements IEmbeddedControlSupport.CanMove
      Get
        Return moving
      End Get
      Set(ByVal Value As FarPoint.Win.Spread.DrawingSpace.Moving)
        moving = Value
      End Set
   End Property

   Public Overridable Property CanSize() As FarPoint.Win.Spread.DrawingSpace.Sizing Implements IEmbeddedControlSupport.CanSize
      Get
        Return sizing
      End Get
      Set(ByVal Value As FarPoint.Win.Spread.DrawingSpace.Sizing)
        sizing = Value
      End Set
   End Property


   Public Sub ControlPaint(ByVal g As Graphics, ByVal r As Rectangle, ByVal appearance As FarPoint.Win.Spread.Appearance,
ByVal value As Object, ByVal isSelected As Boolean, ByVal isLocked As Boolean, ByVal zoomFactor As Single) Implements IEmbeddedControlSupport.ControlPaint
       g.SetClip(r, CombineMode.Intersect)
       g.FillRectangle(New SolidBrush(Me.BackColor), r)
       'g.FillRectangle(New SolidBrush(Me.BackColor), r.X - 120, r.Y - 120, r.Width, r.Height)
       g.DrawString(Me.Text, Font, New SolidBrush(Me.ForeColor), r.X, r.Y)
       AddHandler Me.TextChanged, AddressOf MeTextChanged
   End Sub

  Public Sub MeTextChanged(ByVal sender As Object, ByVal e As EventArgs)
      Me.BackColor = Color.Beige
  End Sub
End Class

Dim tb As New SpreadTextBox()
tb.Name = "TB"
FpSpread1.ActiveSheet.AddControl(tb)