Visual Studio/WPF > UniformGrid > Provides a way to arrange content in a grid where all the cells in the grid have the same size.

Visual Studio 2017 Community (以下VS)
Windows 7 Pro (32bit)

<Window x:Class="_170530_t1500_uniformGrid.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:_170530_t1500_uniformGrid"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="525">
    <Grid>
        <UniformGrid Rows="3" Columns="4">
            <Button Content="1" Height="40"/>
            <Button Content="2" Height="40"/>
            <Button Content="3" Height="40"/>
            <Button Content="4" Height="40"/>
            <Button Content="5" Height="40"/>
            <Button Content="6" Height="40"/>
            <Rectangle Fill="Aqua"/>
            <Button Content="8" Height="40"/>
            <Rectangle Fill="Aqua"/>
        </UniformGrid>
    </Grid>
</Window>