Public Overridable Sub ClearControls() 

Dim instance As SheetView
 
instance.ClearControls()

public virtual void ClearControls()

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 = FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy.DoubleClick;
    
    public virtual FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy ActivationPolicy {
        get {
            return activation;
        }
        set {
            //  activation = Value
        }
    }
    
    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.FillRectangle(New SolidBrush(Me.BackColor), r.X - 120, r.Y - 120, r.Width, r.Height)
        g.DrawString(this.Text, Font, new SolidBrush(this.ForeColor), r.X, r.Y);
        this.TextChanged += new System.EventHandler(this.MeTextChanged);
    }
    
    public void MeTextChanged(object sender, EventArgs e) {
        this.BackColor = Color.Beige;
    }
}

SpreadTextBox tb = new SpreadTextBox();
tb.Name = "TB";
fpSpread1.ActiveSheet.AddControl(tb, 2, 2);

    
    private void Button1Click(object sender, System.EventArgs e) {
        fpSpread1.ActiveSheet.ClearControls();
    }

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 = FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy.DoubleClick

   Public Overridable Property ActivationPolicy() As FarPoint.Win.Spread.DrawingSpace.ChildActivationPolicy Implements FarPoint.Win.Spread.DrawingSpace.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 FarPoint.Win.Spread.DrawingSpace.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 FarPoint.Win.Spread.DrawingSpace.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
FarPoint.Win.Spread.DrawingSpace.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, 2, 2)

Private Sub Button1Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 
    FpSpread1.ActiveSheet.ClearControls()
End Sub