<StackPanel>
    <Button Name="Btn1" Content="Test 1" Command="{Binding CmdDoSomething}" />
    <Button Name="Btn2" Content="Test 2" Command="{Binding CmdDoSomething}" />
    <Button Name="Btn3" Content="Test 3" Command="{Binding CmdDoSomething}" />
</StackPanel>

CmdDoSomething = new DelegateCommand(
    x => DvPat(),
    y => true
);