网格中的一行文本框项目之间出现的差异，而不是其他文本框项目之间的差距 - 无法找出原因

Question

继续自学WPF，而不是继续使用winforms。我还没有进入更详细的绑定方面，试图预先完成我的第一个运行界面，这样我就能更好地掌握xaml和代码隐藏文件如何协同工作。无论如何，我正在尝试构建一个包含四行输入的表，每行有11列，第11列是组合框。所有其他输入都是文本框。下面的代码生成一个边框全部为厚度为2的表。但是，由于我无法弄清楚的原因，当所有xaml定义相同时，它也会在第3行和第4行之间产生间隙。

非常感谢任何可以提供的帮助，我为粗略的代码道歉 - 整理议程上的重点。

注1;这个网格生活在另一个网格中。父行定义设置为auto

注2;如果我在设计器中将页面设计扩展到此网格之外，它在设计时会呈现正常，但在进入调试时会出现间隙。

注3;我将代码复制到VS2012的另一个实例中，它似乎在设计和调试中都能正常工作....

<Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="auto"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="30"/>
                    <ColumnDefinition MinWidth="75"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="auto"/>
                </Grid.RowDefinitions>
                <Label Grid.Column="0" FontWeight="Bold" BorderBrush="Black" BorderThickness="2,2,1,1">A</Label>
                <Label Grid.Column="1" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">B</Label>
                <Label Grid.Column="2" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">C</Label>
                <Label Grid.Column="3" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">D</Label>
                <Label Grid.Column="4" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">E</Label>
                <Label Grid.Column="5" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">F</Label>
                <Label Grid.Column="6" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">G</Label>
                <Label Grid.Column="7" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">H</Label>
                <Label Grid.Column="8" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">I</Label>
                <Label Grid.Column="9" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,1,1" HorizontalContentAlignment="Center">J</Label>
                <Label Grid.Column="10" FontWeight="Bold" BorderBrush="Black" BorderThickness="1,2,2,1" HorizontalContentAlignment="Center">K</Label>
                <TextBox Grid.Column="0" Grid.Row="1" BorderBrush="Black" BorderThickness="2,1,1,1" Padding="1" MinWidth="150"/>
                <TextBox Grid.Column="1" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="2" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="3" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="4" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="5" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="6" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="7" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="8" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="9" Grid.Row="1" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <ComboBox Grid.Column="10" Grid.Row="1">
                    <!--Combobox items-->
</Combobox>
                <TextBox Grid.Column="0" Grid.Row="2" BorderBrush="Black" BorderThickness="2,1,1,1" Padding="1" MinWidth="150"/>
                <TextBox Grid.Column="1" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="2" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="3" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="4" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="5" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="6" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="7" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="8" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <TextBox Grid.Column="9" Grid.Row="2" BorderBrush="Black" BorderThickness="1" Padding="1"/>
                <ComboBox Grid.Column="10" Grid.Row="2">
                    <!-- Combobox items -->
</ComboBox>
                <TextBox Grid.Column="0" Grid.Row="3" BorderBrush="Black" BorderThickness="2,1,1,1" Padding="1" MinWidth="150" Visibility="Visible"/>
                <TextBox Grid.Column="1" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="2" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="3" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="4" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="5" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="6" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="7" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="8" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <TextBox Grid.Column="9" Grid.Row="3" BorderBrush="Black" BorderThickness="1" Padding="1" Visibility="Visible"/>
                <ComboBox Grid.Column="10" Grid.Row="3" Visibility="Visible">
                    <!-- Combobox items -->
</ComboBox>
                <TextBox Grid.Column="0" Grid.Row="4" BorderBrush="Black" BorderThickness="2,1,1,2" Padding="1" MinWidth="150"/>
                <TextBox Grid.Column="1" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="2" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="3" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="4" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="5" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="6" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="7" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="8" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <TextBox Grid.Column="9" Grid.Row="4" BorderBrush="Black" BorderThickness="1,1,1,2" Padding="1"/>
                <ComboBox Grid.Column="10" Grid.Row="4">
                    <!-- Combobox items -->
</ComboBox>
            </Grid>