求助:FreeTextBox控件，如何设置可以在 Insert Image 时上传本地图片而不是填写图片的Url（链接网上的图片）

FreeTextBox的哪个属性可以进行相关设置呢？
===========  以下是其属性  ==============AllowHtmlMode
AssemblyResourceHandlerPath
AutoConfigure
AutoGenerateToolbarsFromString
AutoHideToolbar
AutoParseStyles
BackColor
BaseUrl
BindingContainer (inherited from Control)
BreakMode
ButtonDownImage
ButtonFileExtention
ButtonFolder
ButtonHeight
ButtonImagesLocation
ButtonOverImage
ButtonPath
ButtonSet
ButtonStyle
ButtonStyleActive
ButtonWidth
ClientID
ClientSideTextChanged
Controls (inherited from Control)
ConvertHtmlSymbolsToHtmlCodes
DesignModeBodyTagCssClass
DesignModeCss
DisableIEBackButton
DownLevelCols
DownLevelMessage
DownLevelMode
DownLevelRows
DropDownListCssClass
EditorBorderColorDark
EditorBorderColorLight
EnableHtmlMode
EnableSsl
EnableToolbars
EnableViewState (inherited from Control)
Focus
FontBackColorMenuList
FontBackColorMenuNames
FontFacesMenuList
FontFacesMenuNames
FontForeColorMenuList
FontForeColorMenuNames
FontSizesMenuList
FontSizesMenuNames
FormatHtmlTagsToXhtml
GutterBackColor
GutterBorderColorDark
GutterBorderColorLight
Height
HelperFilesParameters
HelperFilesPath
HtmlModeCss
HtmlModeCssClass
HtmlModeDefaultsToMonoSpaceFont
HtmlStrippedText
ID (inherited from Control)
ImageGalleryPath
ImageGalleryUrl
InsertHtmlMenuList
InsertHtmlMenuNames
InstallationErrorMessage
JavaScriptLocation
Language
NamingContainer (inherited from Control)
Page (inherited from Control)
ParagraphMenuList
ParagraphMenuNames
Parent (inherited from Control)
PasteMode
ReadOnly
RemoveScriptNameFromBooks
RemoveServerNameFromUrls
RenderMode
ScriptMode
ShowTagPath
Site (inherited from Control)
SslUrl
StartMode
StripAllScripting
StylesMenuList
StylesMenuNames
SupportFolder
SymbolsMenuList
TabIndex
TabMode
TemplateSourceDirectory (inherited from Control)
Text
TextDirection
ToolbarBackColor
ToolbarBackgroundImage
ToolbarImagesLocation
ToolbarLayout
Toolbars
ToolbarStyleConfiguration
UniqueID (inherited from Control)
UpdateToolbar
UseToolbarBackGroundImage
ViewStateText
Visible (inherited from Control)
Width
Xhtml
================   以下是其方法  ================
DataBind (inherited from Control)
Dispose
Equals (inherited from Object)
FindControl (inherited from Control)
GetHashCode (inherited from Object)
GetType (inherited from Object)
HasControls (inherited from Control)
LoadPostData
RaisePostBackEvent
RaisePostDataChangedEvent
RenderControl (inherited from Control)
RenderToolbar
RenderToolbarButton
RenderToolbarDropDownList
RenderToolbarSeparator
ResolveUrl (inherited from Control)
SetRenderMethodDelegate (inherited from Control)
SetToolbarButtonLanguage
ToString (inherited from Object)