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　　2.1.6  PRADO 组件类树

　　目前发布的 PRADO 包括如下所示的组件树，这些组件的属性，事件和类的方法在PRADO文档中都可以查到。

TComponent
    TAdodb
    TControl
        TExpression
        TForm
        TLiteral
        TPage
TPlaceHolder
        TRepeater
TRepeaterItem
        TStatements
        TWebControl
            TButton
            TCheckBox
                TRadioButton
            TDropDownList
            THyperLink
            TImage
                TImageButton
            TLabel
            TLinkButton
            TListBox
            TPanel
            TTextBox
                TDatePicker
                THtmlArea
            TValidationSummary
            TValidator
                TCompareValidator
                TCustomValidator
                TRangeValidator
                TRegularExpressionValidator
                    TEmailAddressValidator
                TRequiredFieldValidator