我试图让我的组合框拉伸使用所有的空余空间中展开的窗口。如果窗口的宽度缩小,ToolBarTray将会崩溃。
我使用的网格指定为分别* & 300 2列与宽度。 如何制作组合框来填充行中的所有可用空间?

<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50" />
</Grid.RowDefinitions>
<DockPanel LastChildFill="True" Grid.Row="0">
<Grid DockPanel.Dock="Top">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="300" />
</Grid.ColumnDefinitions>
<ToolBarTray DockPanel.Dock="Left">
<ToolBar Name="Standard">
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
</ToolBar>
<ToolBar Name="Standard2">
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
<Button Height="32">
<StackPanel Orientation="Horizontal" Margin="5,0,5,0" HorizontalAlignment="Right">
<Image Height="24" Width="24" HorizontalAlignment="Center" Source="Images/document.png" />
</StackPanel>
</Button>
</ToolBar>
</ToolBarTray>
<ComboBox Grid.Column="1" MinWidth="200" ></ComboBox>
</Grid>
</DockPanel>
</Grid>