【求助】DockLayoutManager中FloatGroups背景色透明问题

fdkhb

需要在DockLayoutManager设计浮动面板FloatGroups，发现怎么都无法将其背景变为透明，以下是代码

[CSS] 纯文本查看 复制代码

<dxdo:DockLayoutManager.FloatGroups>
                <dxdo:FloatGroup GroupBorderStyle="NoBorder" BorderBrush="Transparent"  FloatSize="200,200" FloatLocation="243.2,80.8000000000001">
                    <dxdo:LayoutPanel BorderBrush="Transparent"  Background="Transparent" ShowBorder="False"   x:Name="paneWarning1"  Caption="报警信息" ShowCaptionImage="False"                                      >
                        <dxdo:LayoutPanel.Appearance>
                            <dxdo:Appearance>
                                <dxdo:Appearance.Normal>
                                    <dxdo:AppearanceObject>
                                        <dxdo:AppearanceObject.Background>
                                            <SolidColorBrush Color="#00FFF700" />
                                        </dxdo:AppearanceObject.Background>
                                    </dxdo:AppearanceObject>
                                </dxdo:Appearance.Normal>
                                <dxdo:Appearance.Active>
                                    <dxdo:AppearanceObject Background="#00CD0A0A" Foreground="#FFF63737"/>
                                </dxdo:Appearance.Active>
                            </dxdo:Appearance>
                        </dxdo:LayoutPanel.Appearance>
                    </dxdo:LayoutPanel>

                </dxdo:FloatGroup>
            </dxdo:DockLayoutManager.FloatGroups>

运行以后浮动面板样式如下，并没有透明


求助各位大神有知道怎么解决的吗？