下面是我的组合框代码，它有另外两个组合框，现在我想要使用combobox2切换按钮改变它的方向，即切换按钮应指向右边，也可以点击切换按钮组合框应该在右侧打开，这样它就不会隐藏我的组合框1项，怎么做？
<Window x:Class="ComboBox.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Color x:Key="GrayColor_">#FF928B81</Color>
<Color x:Key="LightGrayColor_">#FFC3C3C3</Color>
<Color x:Key="LightLightGrayColor_">#FFF1F1F1</Color>
<SolidColorBrush x:Key="GrayColor" Color="{StaticResource GrayColor_}"/>
<SolidColorBrush x:Key="LightGrayColor" Color="{StaticResource LightGrayColor_}"/>
<SolidColorBrush x:Key="LightLightGrayColor" Color="{StaticResource LightLightGrayColor_}"/>
<Color x:Key="BlueColor_">#0073b0</Color>
<Color x:Key="DarkBlueColor_">#FF004165</Color>
<Color x:Key="LightBlueColor_">#FFa4ddfa</Color>
<SolidColorBrush x:Key="BlueColor" Color="{StaticResource BlueColor_}" />
<SolidColorBrush x:Key="DarkBlueColor" Color="{StaticResource DarkBlueColor_}" />
<SolidColorBrush x:Key="LightBlueColor" Color="{StaticResource LightBlueColor_}" />
<SolidColorBrush x:Key="Foreground" Color="Black"/>
<SolidColorBrush x:Key="ForegroundWhite" Color="White"/>
<Style x:Key="LightGrayBox" TargetType="{x:Type Border}">
<Setter Property="Background" Value="White"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="BorderBrush" Value="{StaticResource LightGrayColor}" />
</Style>
<Style x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Border x:Name="Border" Style="{DynamicResource LightGrayBox}" Grid.ColumnSpan="2" Background="{StaticResource BlueColor}" />
<Path x:Name="Arrow" Grid.Column="1" Opacity="0.6" Fill="{StaticResource LightBlueColor}" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="Arrow" Property="Opacity" Value="1" />
<Setter TargetName="Arrow" Property="Fill" Value="{StaticResource LightBlueColor}" />
<Setter TargetName="Border" Property="BorderBrush" Value="{DynamicResource BlueColor}"/>
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="true">
<Setter TargetName="Arrow" Property="Opacity" Value="1" />
<Setter TargetName="Arrow" Property="Fill" Value="{StaticResource LightBlueColor}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ComboBoxToggleButtonActive" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Border x:Name="Border" Grid.ColumnSpan="2" Background="{DynamicResource BlueColor}" />
<Path x:Name="Arrow" Grid.Column="1" Opacity="1" Fill="{StaticResource LightBlueColor}" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="true">
<Setter TargetName="Border" Property="Background" Value="{DynamicResource BlueColor}" />
<Setter TargetName="Border" Property="BorderBrush" Value="White"/>
<Setter Property="Foreground" Value="White" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
<Border x:Name="PART_ContentHost" Background="{TemplateBinding Background}" />
</ControlTemplate>
<Style x:Key="StandardComboBox" TargetType="{x:Type ComboBox}">
<Setter Property="Foreground" Value="{StaticResource Foreground}"/>
<Setter Property="Height" Value="25"/>
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="IsEditable" Value="True" />
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="VerticalAlignment" Value="Top"/>
<Setter Property="Width" Value="120"/>
<Setter Property="IsSelected" Value="{Binding IsKeyboardFocusWithin, RelativeSource={RelativeSource Self}, Mode=OneWay}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton" Style="{StaticResource ComboBoxToggleButton}" Grid.Column="2" Focusable="false" ClickMode="Press"
IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" />
<Label Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3,3,23,3" VerticalAlignment="Center" HorizontalAlignment="Left" />
<!--<ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3,3,23,3" VerticalAlignment="Center" HorizontalAlignment="Left" />-->
<TextBox x:Name="PART_EditableTextBox"
CaretBrush="{DynamicResource ForegroundWhite}"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="3,3,23,3"
Focusable="True"
Background="Transparent"
Foreground="{StaticResource ForegroundWhite}"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}"/>
<Popup VerticalOffset="-1" SnapsToDevicePixels="True" Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Fade">
<Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="200">
<Border x:Name="DropDownBorder" Style="{DynamicResource LightGrayBox}"/>
<ScrollViewer SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="20"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="ToggleButton" Property="Style" Value="{StaticResource ComboBoxToggleButtonActive}" />
<Setter TargetName="ContentSite" Property="Foreground" Value="{DynamicResource ForegroundWhite}"/>
</Trigger>
<Trigger Property="IsSelected" Value="False">
<Setter TargetName="PART_EditableTextBox" Property="Foreground" Value="{DynamicResource Foreground}"/>
<Setter TargetName="ContentSite" Property="Foreground" Value="{DynamicResource Foreground}"/>
</Trigger>
<Trigger Property="IsEditable" Value="true">
<Setter Property="IsTabStop" Value="false"/>
<Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
<Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Resources>
<Style TargetType="ComboBoxItem">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Border Name="Border" Padding="2" SnapsToDevicePixels="true" BorderThickness="1" Background="{StaticResource BlueColor}">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="Border" Property="Background" Value="{DynamicResource BlueColor}"/>
<Setter TargetName="Border" Property="Padding" Value="2,3,2,3" />
<Setter Property="Foreground" Value="White" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style.Resources>
</Style>
</Window.Resources>
<Grid>
<ComboBox Height="23" Margin="122,32,100,0" Style="{StaticResource StandardComboBox}" Name="comboBox1" VerticalAlignment="Top" IsEditable="True" Text="Settings">
<ComboBoxItem>
<ComboBox Style="{StaticResource StandardComboBox}" Name="comboBox2" VerticalAlignment="Top" >
<StackPanel Orientation="Horizontal">
<Label Content="Logout Time:"></Label>
<Label></Label>
</StackPanel>
<ComboBoxItem Content="10 Min"></ComboBoxItem>
<ComboBoxItem Content="20 Min"></ComboBoxItem>
<ComboBoxItem Content="30 Min"></ComboBoxItem>
<ComboBoxItem Content="40 Min"></ComboBoxItem>
<ComboBoxItem Content="50 Min"></ComboBoxItem>
</ComboBox>
</ComboBoxItem>
<ComboBoxItem Content="Logout"></ComboBoxItem>
</ComboBox>
</Grid>
</Window>
答案 0 :(得分：0)
您需要为ComboBox控件定义一个新的ControlTemplate。您可以在MSDN上的Customizing the Appearance of an Existing Control by Using a ControlTemplate文章中找到如何定义新的ControlTemplate。一个好的起点是实现默认的ControlTemplate，然后根据需要自定义它。您可以在MSDN上的ComboBox Styles and Templates页面中找到ComboBox的默认ControlTemplate。
作为起点，从MSDN上链接页面的默认ControlTemplate中找到以下控件：
<ToggleButton x:Name="ToggleButton"
Template="{StaticResource ComboBoxToggleButton}"
Grid.Column="2"
Focusable="false"
ClickMode="Press"
IsChecked="{Binding IsDropDownOpen, Mode=TwoWay,
RelativeSource={RelativeSource TemplatedParent}}"/>
<ContentPresenter x:Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="3,3,23,3"
VerticalAlignment="Stretch"
HorizontalAlignment="Left">
</ContentPresenter>
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Margin="3,3,23,3"
Focusable="True"
Background="Transparent"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}" />
ToggleButton显然是Button控件中的ComboBox，ContentSite ContentPresenter是所选项目显示在Button和PART_EditableTextBox TextBox旁边的位置{1}}是控件设置为TextBox时使用的可编辑IsEditable="True"。如果您可以编写XAML，那么您可以简单地安排这些内部控件以满足您的要求。
更新＆gt;＆gt;＆gt;
为了旋转控件，最简单的方法是使用RotateTransform ...试试这个：
<Path x:Name="Arrow" Grid.Column="1" HorizontalAlignment="Center"
VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z" >
<Path.Fill>
<SolidColorBrush Color="{DynamicResource GlyphColor}"/>
</Path.Fill>
<Path.LayoutTransform>
<RotateTransform Angle="90" />
</Path.LayoutTransform>
</Path>
更新2（希望最后一次）＆gt;＆gt;＆gt;
ComboBox弹出窗口是Popup控件，因此要了解如何向右打开它，您需要研究如何向右打开Popup。为此，我要查看MSDN上Popup Placement Behavior页面的弹出窗口定位部分。
现在，请记住，我们不是为您完成所有您的工作。我觉得我已为您提供了足够的信息，以便您完成自定义ComboBox控制。祝你好运。
答案 1 :(得分：0)
可能会有帮助
<ComboBox Height="23" Margin="122,32,100,0" Style="{StaticResource StandardComboBox}" Name="comboBox1" VerticalAlignment="Top" IsEditable="True" Text="Settings">
<ComboBoxItem>
<ComboBox ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Hidden" Name="comboBox2" VerticalAlignment="Top">
<ComboBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" IsItemsHost="True"/>
</ItemsPanelTemplate>
</ComboBox.ItemsPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Logout Time:"></Label>
<Label></Label>
</StackPanel>
<ComboBoxItem Content="10 Min"></ComboBoxItem>
<ComboBoxItem Content="20 Min"></ComboBoxItem>
<ComboBoxItem Content="30 Min"></ComboBoxItem>
<ComboBoxItem Content="40 Min"></ComboBoxItem>
<ComboBoxItem Content="50 Min"></ComboBoxItem>
</ComboBox>
</ComboBoxItem>
<ComboBoxItem Content="Logout">
</ComboBoxItem>
</ComboBox>
</Grid>