componentes no aparecen en el formulario

[[oscarac]]

Solo esto me aparece cuando presiono alt+f12

Código Delphi [-]
object frmMain: TfrmMain
  Left = 74
  Top = 52
  BorderIcons = [biMinimize, biMaximize]
  BorderStyle = bsSingle
  Caption = 'Principal'
  ClientHeight = 615
  ClientWidth = 956
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  FormStyle = fsMDIForm
  OldCreateOrder = False
  Position = poScreenCenter
  Scaled = False
  WindowState = wsMaximized
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object Panel1: TPanel
    Left = 0
    Top = 0
    Width = 956
    Height = 615
    Align = alClient
    Enabled = False
    FullRepaint = False
    TabOrder = 0
    Visible = False
  end
end

lo curioso es que cuando quiero agregar el mismo componente me dice que ya existe....