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<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="30"></RowDefinition>
<RowDefinition ></RowDefinition>
</Grid.RowDefinitions>
<Expander >
<Border Background="Green" Height="50" Width="150"></Border>
</Expander>
<Button Content="ok" Height="20" Grid.Row="1" VerticalAlignment="Top"></Button>
</Grid>
是否有任何方式控件不在共享网格单元? –