Access denied error

Hi Friends,

I have written below code to create a dynamic control ; its working fine for site admin , contribute permissions users ... however its giving access denied error for visitor groups ? any idea and solution ? i tried with elevated privileges and Catchaccess denied exception , still no luck... 

erroring in this line  this.Controls.Add(this.htmlEditor);

 SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    bool originalCatchValue = SPSecurity.CatchAccessDeniedException; 
                    SPSecurity.CatchAccessDeniedException = false;
                    SPRibbon ribbon = SPRibbon.GetCurrent(this.Page);
                    if (ribbon != null)
                    {
                        ribbon.TrimById("Ribbon.EditingTools.CPEditTab.Layout");
                        ribbon.TrimById("Ribbon.EditingTools.CPEditTab.EditAndCheckout");
                    }
                    this.htmlEditor.Field = new RichHtmlField();
                    this.htmlEditor.Field.ControlMode = SPControlMode.Edit;
                    this.htmlEditor.Field.EnableViewState = true;
                    this.htmlEditor.Field.AllowReusableContent = false;
                    this.htmlEditor.Field.MinimumEditHeight = this.MinimumEditHeight;
                    this.htmlEditor.Field.PopupEditorMode = true;
                    this.htmlEditor.Field.HasInitialFocus = true;
                    this.htmlEditor.Field.UseInlineStyle = true;
                    this.Controls.Add(this.htmlEditor);// access denied  error for visitors but it works for contribute permission users
                    base.OnInit(e);
                    SPSecurity.CatchAccessDeniedException = originalCatchValue;
                });

Thanks,

Kiran