why I should use ScaleX=”2″ for example instead of double the width of my control ??
<Button Width = "100" Content="Button1"/>
<Button Width = "50" Content="Button2">
<Button.RenderTransform>
<ScaleTransform ScaleX="2" />
</Button.RenderTransform>
</Button>
both buttons look exactly the same so again, what scale is good for
What if it was more complicated than a Button with a Width? What if you had a complex Path/Geometry, or maybe even a group of controls? You wouldn’t want to go and manually change everything. What if you had a custom control, where you wanted to give one instance the size 100×100, and another instance 150×150? What if you were implementing zoom functionality (think google maps)?
In short, for your specific example, it doesn’t provide much use. But there are many other cases where it does.