StackPanel
特点：子元素一行或者一列排列
<StackPanel Background="#ECE9D8">
<TextBlock Margin="3">Look for:</TextBlock>
<ComboBox Margin="3"/>
<TextBlock Margin="3">Filtered by:</TextBlock>
<ComboBox Margin="3"/>
<Button Margin="3,5">Search</Button>
<CheckBox Margin="3">Search in titles only</CheckBox>
<CheckBox Margin="3">Match related words</CheckBox>
<CheckBox Margin="3">Search in previous results</CheckBox>
<CheckBox Margin="3">Highlight search hits (in topics)</CheckBox>
</StackPanel>
