- C#WPF中 向Data Extensions Expander控件里增加内容不显示，怎么解决?程序未编译，调试之前看不到展开后的内容，很奇怪。运行后能看到Data Extensions Expander控件里的其它控件和内容，没有问题。但是调试前创建Expander，在Expander的Grid内添加其他控件和内容，为什么就不显示呢？请高手解答。
<Expander Expanded="expdrDataExtentions_Expanded" Header="Data Extensions" Name="expdrDataExtensions" BorderBrush="Black" BorderThickness="1" FontFamily="Arial" IsEnabled="True" Focusable="True" Height="Auto">
<Expander.ContextMenu>
<ContextMenu DataContext="{Binding}" />
</Expander.ContextMenu>
<Expander.Background>
<LinearGradientBrush EndPoint="0.8,1" StartPoint="0.5,0">
<GradientStop Color="#ddd" Offset="0" />
<GradientStop Color="white" Offset="1" />
</LinearGradientBrush>
</Expander.Background>
<Grid Background="White" x:Name="gridDataExtensions" IsEnabled="True">
<Grid.Resources>
<BooleanToVisibilityConverter x:Key="boolToVisible"/>
</Grid.Resources>
<Border Margin="3,1,1,1" BorderBrush="Black" BorderThickness="1">
<StackPanel Margin="2" Orientation="Vertical" Name="stckPnlDataExtensions">
<GroupBox Header="Data Extensions" Name="grpbDataExtensions" VerticalAlignment="Top" BorderThickness="1" BorderBrush="Black" >
<Grid Name="gridDataExtensionsTypes" IsHitTestVisible="True" UseLayoutRounding="False">
<CheckBox ToolTip="Enable Data Extensions" ToolTipService.ShowOnDisabled="True" Content="EnableDataExtensions" Height="16" HorizontalAlignment="Left" Margin="6,6,0,0" Name="chkDataExtensions" VerticalAlignment="Top" Checked="chkDataExtensions_Checked" Unchecked="chkDataExtensions_Checked" />
<RadioButton IsEnabled="False" ToolTipService.ShowOnDisabled="True" GroupName="DataExtensions" Content="Stream to TCP port" Height="16" HorizontalAlignment="Left" Margin="25,28,0,0" Name="rdBtnStreamToTcpPort" VerticalAlignment="Top" Checked="rdBtnStreamToTcpPort_Checked" Unchecked="rdBtnStreamToTcpPort_Checked">
<RadioButton.ToolTip>
Streams the tag data to TCP port.
</RadioButton.ToolTip>
</RadioButton>
<TextBox MaxLength="5" Visibility="Visible" HorizontalAlignment="Left" Margin="161,25,0,0" Name="txtTcpPort" Width="67" Text="9055" Height="23" VerticalAlignment="Top" PreviewTextInput="txtTcpPort_PreviewTextInput" TextChanged="txtTcpPort_TextChanged" LostKeyboardFocus="txtTcpPort_LostKeyboardFocus" />
<RadioButton IsEnabled="False" ToolTipService.ShowOnDisabled="True" GroupName="DataExtensions" Content="Web Service" Height="16" HorizontalAlignment="Left" Margin="25,58,0,0" Name="rdBtnWebService" VerticalAlignment="Top" Checked="rdBtnWebService_Checked">
<RadioButton.ToolTip>
Enables web streaming.
</RadioButton.ToolTip>
</RadioButton>
<RadioButton IsEnabled="False" ToolTipService.ShowOnDisabled="True" GroupName="DataExtensions" Content="Stream to Serial Port" Height="16" HorizontalAlignment="Left" Margin="25,88,0,0" Name="rdBtnStreamToSerialPort" VerticalAlignment="Top" Checked="rdBtnStreamToSerialPort_Checked">
<RadioButton.ToolTip>
Enables Serial Port Streaming.
</RadioButton.ToolTip>
</RadioButton>
<ComboBox IsEnabled="False" Height="23" HorizontalAlignment="Left" Margin="161,81,0,0" Name="comboBox1" VerticalAlignment="Top" Width="67" />
<Label IsEnabled="False" Visibility="Hidden" Content="Status:" Height="23" HorizontalAlignment="Left" Margin="3,111,0,0" Name="lblTcpStreamStatus" VerticalAlignment="Top" />
</Grid>
</GroupBox>
</StackPanel>
</Border>
</Grid>
</Expander>
C#WPF中 在Expander 控件里增加控件或其它内容不显示，怎么解决？
