I have created a window, where two vertical -oriented stack panel(left and right) are in the third, horizontal-oriented stackpanel.
Left stack panel holds a number of controls and a button >Hide<, binded to command. And I dlike to animate a "hiding" right stackpanel and resize a window to the width of only left stackpanel. How to do this in the most simple way?
I have found [WPF stackpanel visibilty animation](https://stackoverflow.com/questions/7685364/wpf-stackpanel-visibilty-animation) but , it will not resize a window.

My code is:

```
<Window x:Class="Namespace.MainWindow"
 ...
 x:Name="ololo"
        Height="400" Width="500">
 .....    
<StackPanel Orientation="Horizontal">
            <StackPanel x:Name="Left" Orientation="Vertical">
                <Button Margin="0,10,0,0" Command="{Binding HideCommand}">Hide</Button>
            </StackPanel>
            <StackPanel x:Name="Right" Orientation="Vertical">
            <!--<Controls>-->
            </StackPanel>
    </StackPanel>

```