wpf 中Grid后面总是多一空白行

 <Grid>
    <dxg:GridControl Name="gridErrorsInfo" AutoPopulateColumns="True" ShowBorder="False" ShowLoadingPanel="False" 
         HorizontalAlignment="Stretch" VerticalAlignment="Stretch"  AllowColumnMRUFilterList="False"
         AllowMRUFilterList="False" Margin="0,0,4,28" MouseDoubleClick="gridErrorsInfo_MouseDoubleClick">
         <dxg:GridControl.Columns>
             <dxg:GridColumn Name="Num" FieldName="Num" Header="NUM" Width="100"/>
             <dxg:GridColumn Name="PageName" FieldName="PageName" Header="Name" Width="150"/>
             <dxg:GridColumn Name="Errors" FieldName="ErrorDetail" Width="Auto" Header="Megs"/>
         </dxg:GridControl.Columns>
        <dxg:GridControl.View>
            <dxg:TableView Name="ErrorViewList" AutoWidth="True" AllowMoveColumnToDropArea="False"/>
        </dxg:GridControl.View>
    </dxg:GridControl>
</Grid>

<DataGrid AutoGenerateColumns="False" Height="190" HorizontalAlignment="Left" Margin="2,5,0,0" Name="dataChartSingle" VerticalAlignment="Top" Width="225" IsReadOnly="True">
         <DataGrid.Columns>
             <DataGridTextColumn Header="VarNumber" Binding="{Binding VarName}" Width="130"  CanUserSort="False" CanUserResize="True"/>                                                                       
             <DataGridTextColumn Header="MaxVar" Binding="{Binding VarMax}" Width="48" CanUserSort="False" CanUserResize="True" />
             <DataGridTextColumn Header="MinVar" Binding="{Binding VarMin}" Width="*" CanUserSort="False" CanUserResize="True" />                                                                        
        </DataGrid.Columns>                                                                   
</DataGrid>