How to bind RadDataPager.PageSize to RadNumericUpDown.Value in code

Question

I have a RadGridView, a RadDataPager and a RadNumericUpDown all defined in code.

Now i want to bind the RadDataPager.PageSize to the RadNumericUpDown.Value so the pagesize of the pager is changeable via the RadNumericUpDown control.

Thus i try:

RadDataPager dataPager = new ...;
RadNumericUpDown pageSizeSelector = new ...;

Binding b = new Binding();
b.Mode = BindingMode.TwoWay;
b.Source = pageSizeSelector.Value;

pageSizeSelector.SetBinding(dataPager.PageSize, b);

But this generates an error about the dataPager.PageSize not being a DependencyProperty. What i'm a missing?

EDIT
Thanks to Klinger i got it straight. SetBinding wants the Static Definition of the DP, not a reference to the instance.

Binding b = new Binding("PageSize");
b.Mode = BindingMode.TwoWay;
b.Source = dataPager;
pageSizeSelector.SetBinding(RadNumericUpDown.ValueProperty, b);