WPF UniformGrid 空间均分

UniformGrid 在有限的空间内均分剩余的空间

<UserControl x:Class="WpfApp1.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WpfApp1"
             mc:Ignorable="d" 
             d:DesignHeight="100" d:DesignWidth="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
        </Grid.RowDefinitions>
        
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>

        <!--UniformGrid 用于修饰部分空间元素排布-->
        <!--UniformGrid 在有限的空间内均分剩余的空间-->
        <UniformGrid Grid.Row="0" Grid.Column="0" Rows="3" Columns="3" Background="Violet">
            <Button Width="100" Height="20" Content="按钮1"/>
            <Button Width="100" Height="20" Content="按钮2"/>
            <Button Width="100" Height="20" Content="按钮3"/>
            
            <Button Width="100" Height="20" Content="按钮4"/>
            <Button Width="100" Height="20" Content="按钮5"/>
            <Button Width="100" Height="20" Content="按钮6"/>
            
            <Button Width="100" Height="20" Content="按钮7"/>
            <Button Width="100" Height="20" Content="按钮8"/>
            <Button Width="100" Height="20" Content="按钮9"/>
        </UniformGrid>
        <UniformGrid Grid.Row="0" Grid.Column="1" Rows="3" Columns="2" Background="BurlyWood">
            <Button Width="100" Height="20" Content="按钮1"/>
            <Button Width="100" Height="20" Content="按钮2"/>
            <Button Width="100" Height="20" Content="按钮3"/>

            <Button Width="100" Height="20" Content="按钮4"/>
            <Button Width="100" Height="20" Content="按钮5"/>
            <Button Width="100" Height="20" Content="按钮6"/>

            <Button Width="100" Height="20" Content="按钮7"/>
            <Button Width="100" Height="20" Content="按钮8"/>
            <Button Width="100" Height="20" Content="按钮9"/>
        </UniformGrid>
    </Grid>
</UserControl>