Darren.NET

元件包括可視（Visual）與非可視(Non-Visual)元件
TObject是所有元件的始祖
TControl是所有可視元件（VCL）的始祖
TObject => TPersistent => TComponent => TControl => TLabel
                                                                                                       => TEdit => TMaskEdit
                                                                                                       => TMemo
                                                                                                       => TButton => TBitBtn
                                                                                                                               => TSpeedButton
                                                                                                       => TCheckBox
                                                                                                       => TRadioButton
                                                                                                       => TListBox
                                                                                                       => TComboBox
                                                                                                       => TPanel
                                                                                                       => TGroupBox
                                                                                                       => TScrollBar
                                                                                                       => TWinControl
                                                                                                       => TGraphicControl
                                                                                                       .................