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<Window x:Class="CommandSample.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:CommandSample"
xmlns:vm="clr-namespace:CommandSample.ViewModels"
mc:Ignorable="d"
Title="MainWindow" Height="300" Width="300">
<Window.DataContext>
<vm:MessageViewModel/>
</Window.DataContext>
<StackPanel>
<TextBox x:Name="tbMain"/>
<Button Content="Click"
Command="{Binding DisplayMessageCommand}"
CommandParameter="{Binding ElementName=tbMain, Path=Text}"/>
</StackPanel>
</Window>