如果已設置組合框的ItemSource屬性,爲什麼可以單擊組合框的下拉按鈕不顯示可用項目列表?這可能與但相同的控制範圍內,則顯示用戶控制背後的任何上下文菜單:WPF組合框項目列表/上下文菜單呈現在父項後面
的XAML該控制如下:
<Border Name="Border" Padding="5">
<ScrollViewer VerticalScrollBarVisibility="Auto">
<ScrollViewer.Resources>
<Style TargetType="{x:Type CheckBox}">
<Setter Property="Padding" Value="8,0,0,0"/>
<Setter Property="VerticalAlignment" Value="Center"/>
</Style>
</ScrollViewer.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="5,4,0,4" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20" />
<ColumnDefinition SharedSizeGroup="labelColumn1" />
<ColumnDefinition SharedSizeGroup="labelColumn2" />
<ColumnDefinition SharedSizeGroup="dataEntryColumn" />
<ColumnDefinition Width="30"/>
<ColumnDefinition SharedSizeGroup="labelColumn2"/>
<ColumnDefinition SharedSizeGroup="dataEntryColumn" />
<ColumnDefinition MaxWidth="0" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition MinHeight="23" />
<RowDefinition MinHeight="23" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock Text="Geometry Type" VerticalAlignment="Center" Grid.Column="1" Grid.Row="0"/>
<ComboBox Grid.Column="3" Margin="6,1,0,1" Grid.Row="0" Width="150"
Name="cmboGeometryTypes"
SelectedItem="{Binding GeometryType, Mode=TwoWay}"
HorizontalAlignment="Left"
DisplayMemberPath="Name"
Grid.ColumnSpan="1"
/>
<TextBlock Text="Symbol Type"
Grid.Column="1" Grid.Row="1" VerticalAlignment="Center"/>
<ComboBox
Name="cmboSymbolEditors"
SelectedItem="{Binding SymbolEditorViewModel, Mode=TwoWay}"
HorizontalAlignment="Left"
DisplayMemberPath="Alias"
Width="150"
Grid.Column="3"
Margin="6,1,0,1"
Grid.Row="1"
Grid.ColumnSpan="1" />
</Grid>
<Label Padding="10,0,0,0" Margin="10,0,0,3" Style="{StaticResource fadingLabelSeperatorStlye}" Grid.Row="1">
Editor
</Label>
<local:SymbologyEditorControl x:Name="editor" Grid.Row="2"/>
</Grid>
</ScrollViewer>
</Border>
和下面我觀察效果被示出
我該如何解決這個問題?
首先,您是否嘗試添加邊距,以便您可以看到它是否真的在UI的其餘部分之後,或者是否完全沒有繪製出來 –
不,我沒有這樣做。但是,如果我使用ListBox,我會看到ComboBox未顯示的可用項目列表。鑑於與上下文菜單相關的問題,我懷疑組合框列表正在繪製在父項後面。 –