How can I change the height of the buttons proportionally when the window is resized?

Question

WPF

Why, when resizing the window, the buttons change proportionally only in width A in height and in height their size remains the same
Here are the Create and close buttons

<Window x:Class="FileMan.Window1"
        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:FileMan"
        mc:Ignorable="d"
        Title="Window1" Height="239.611" Width="493.766">
    <StackPanel>
        <!-- MaxHeight="255.974" MaxWidth="493.766" -->
        <Border Padding="20">
            <StackPanel>
                <Label FontSize="15">Name</Label>
                <TextBox FontSize="15"></TextBox>
                <Label FontSize="15">Size</Label>
                <TextBox FontSize="15"></TextBox>
            </StackPanel>
        </Border>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>

            </Grid.ColumnDefinitions>
            <Button VerticalAlignment="Stretch" HorizontalAlignment="Stretch">Close</Button>
            <Button VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Column="1">Create</Button>
        </Grid>
    </StackPanel>
</Window>

Answer 1

A StackPanel in Vertical orientation makes all elements have a minimum height.
Your Grid option doesn't work as it should because it's Height="*"set for the second row, the one that needs to be stretched.
In this case, I would use the DockPanel - in it (by default) the last element is stretched to the entire remaining volume.