Example of how to remove the spark panel drop-down shadow using the skinclass style in flex gumbo

In the next flex gumbo, how does one remove the spark panel drop-down shadow through the skinclass style.

 The following is main. mxml: <? XML version =" 1.0 "Encoding =" UTF-8 "?> <S: Application name =" Spark_panel_skinclass_dropshadow_test "Xmlns: FX =" Http://ns.adobe.com/mxml/2009 "Xmlns: S =" Library: // ns.adobe.com/flex/spark "> <S: panel title =" Spark panel title "Skinclass =" Skins. custompanelskin_nodropshadow "Width ="200 "Horizontalcenter =" 0 "Verticalcenter =" 0 "> <S: vgroup left =" 20 "Right =" 20 "Top =" 20 "Bottom =" 20 "> <S: richeditabletext id =" Richeditabletxt "Text =" The quick brown fox jumps over the lazy dog. "Width =" 100% "Height ="100% "/> </S: vgroup> </S: Panel> </S: Application>

 The following code shows customfxpanelskin_nodropshadow.mxml:  <? XML version = "1.0" encoding = "UTF-8" ?>   <  S : Sparkskin   Name = "Custompanelskin_nodropshadow"           Xmlns : FX =Http://ns.adobe.com/mxml/2009"           Xmlns : S = "Library: // ns.adobe.com/flex/spark"           Alpha . Disabled = "0.5"  >       <  S : States  >           <  S : State  Name = "Normal"   />           <  S : State   Name = "Disabled"   />       </  S : States  >         <  FX : Metadata >       < ! [CDATA [[hostcomponent ("spark. components. Panel")] >       </  FX : Metadata  >         <  FX : Script  > /* Define the skin elements that shoshould not be colorized. for panel, border and title backround are skinned, but the content area and title text are not. */static private const exclusions: array = ["background", "titlefield", "contentgroup"]; override public function get colorizeexclusions (): Array {return exclusions ;} /* define the content fill items that shoshould be colored by the "contentbackgroundcolor" style. */static private const contentfill: array = ["bgfill"]; override public function get contentitems (): Array {return contentfill }; </  FX : Script  >         <! -- Layer 1: border -->       < S : Rect   Left = "0"   Right = "0"   Top = "0"   Bottom = "0"  >           <  S : Stroke  >               < S : Solidcolorstroke   Color = "0"   Alpha = "0.50"   Weight = "1"   />           </  S : Stroke  >       </  S : Rect >         <! -- Layer 2: background fill -->       <! --- Defines the appearance of the panelskin class's background. -->       <  S : Rect   ID = "Background"   Left = "1"   Top = "1"   Right = "1"   Bottom = "1"  >           <  S : Fill  >           <! --- Defines the panelskin class's background fill. The default color is 0xffffff. -->               <  S : Solidcolor   Color = "0 xffffff"   ID = "Bgfill"   />          </  S : Fill  >       </  S : Rect  >         <! -- Layer 3: title bar fill -->       <  S : Rect   Left = "1"   Right = "1"  Top = "1"   Height = "30"  >          <  S : Fill  >               <  S : Lineargradient   Rotation = "90"  >                   < S : Gradiententry   Color = "0xe2e2e2"   />                   <  S : Gradiententry   Color = "0xd9d9d9"   />               </  S : Lineargradient  >          </ S : Fill  >       </  S : Rect  >         <! -- Layer 4: title bar highlight -->       <  S : Rect   Left = "1"   Right = "1"   Top ="1"   Height = "30"  >          <  S : Stroke  >               <  S : Lineargradientstroke   Rotation = "90"   Weight = "1"  >                  <  S : Gradiententry   Color = "0 xeaeaea"   />                   <  S : Gradiententry   Color = "0xd9d9d9"   />               </  S : Lineargradientstroke  >         </  S : Stroke  >       </  S : Rect  >       <  S : Rect   Left = "1"   Right = "1"   Top ="31"   Height = "1"  >           <  S : Fill  >               <  S : Solidcolor   Color = "0xc0c0c0"   />           </  S :Fill  >       </  S : Rect  >         <! -- Layer 5: Text -->       <! --- Defines the appearance of the panelskin class's title bar. -->       <  S : Simpletext   ID = "Titlefield"   Linebreak = "Explicit"               Left = "10"   Right = "4"   Top = "2"   Height = "30"                Verticalalign = "Middle"   Fontweight = "Bold"   />         <  S : Group  ID = "Contentgroup"               Left = "1"   Right = "1"   Top = "32"   Bottom = "1"   />     </  S : Sparkskin  >