How to bind slider.value to grid.width programmatically?

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WPF

Hi,
I have a slider and a grid(child grid) inside a "Main grid".(the "Main grid" has 2 rows and in each row i have added the slider and grid)
1 - i want to bind the minimum of the slider to the "Main grid"'s width.
2 - i want to bind the child grid's width to the sliders value.
3 - i want to do them programmatically and not with xaml.

i have asked a binding question before but it didn't work(binding the sliders minimum to the "Main grid"'s width).
here's the code :

Grid Maingrid = new Grid();
Slider s1 = new Slider();

Binding minWidthBinding = new Binding();
minWidthBinding.Path = new PropertyPath(Grid.ActualWidthProperty);
minWidthBinding.ElementName = "Maingrid";
BindingOperations.SetBinding(s1, Slider.ValueProperty, minWidthBinding);

Actually i am making a kind of zoom in the width of the grid by using the slider.
Sorry for my long questions:D
Thanks