WPF move Button from StackPanel to Grid cell does not work - wpf

Question

I've got a grid (2x2) and Buttons inside of the grid.
I want to move a Button from cell(0,0) to cell (0,1) programmatically.
A: Does work (programmatically)
Move a Button from one grid cell to another grid cell.
B: Does NOT work (programmatically)
Move a Button inside of a StackPanel to a grid cell.
C: Does work (programmatically)
Move the whole StackPanel (with the Button inside) to another grid cell
What can I do?
<Window x:Class="CovidGamePrototype.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"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*" />
<RowDefinition Height="1*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<StackPanel Name="stackPanel" Grid.Column="0" Grid.Row="0" Orientation="Vertical">
<Button Name="btnTopLeft1" Content="I am TopLeft 1" Height="Auto" />
<Button Name="btnTopLeft2" Content="I am TopLeft 2" Height="Auto" />
</StackPanel>
<Button Name="btnBottomLeft" Grid.Column="0" Grid.Row="1" Width="Auto" Content="I am BottomLeft" />
<Button Name="btnTopRight" Grid.Column="1" Grid.Row="0" Content="I am TopRight" />
<Button Name="btnBottomRight" Grid.Column="1" Grid.Row="1" Content="I am BottomRight"/>
</Grid>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
// does NOT work (move from left to right)
// this Button is inside of a StackPanel
Grid.SetColumn(btnTopLeft1, 1);
Grid.SetZIndex(btnTopLeft1, 5);
// works (move from left to right)
Grid.SetColumn(btnBottomLeft, 1);
Grid.SetZIndex(btnBottomLeft, 5);
// works (move from left to right)
// Grid.SetColumn(stackPanel, 1);
// Grid.SetZIndex(stackPanel, 5);
}
}

Answer 1

Remove the Button from StackPanel and insert the Button into the parent of the StackPanel which is a Grid in your case:
stackPanel.Children.Remove(btnTopLeft1);
var grid = (stackPanel.Parent as Grid);
grid?.Children.Add(btnTopLeft1);
Grid.SetColumn(btnTopLeft1, 1);
Grid.SetZIndex(btnTopLeft1, 5);