Hello Eyal,

You can use the information provided by the PanZoomBar.SelectionStart / SelectionEnd properties to achieve the desired effect (SelectionStart / SelectionEnd provide relative value between 0 and 1 that represents the position of the respective slider thumbs across the whole data range i.e. when SelectionEnd = 1 this means that the user has scrolled to the end).

In order to pass this information to the ViewModel, you can use implicit style targeting the PanZoomBar control and create two-way bindings between PanZoomBar.SelectionStart / SelectionEnd properties and properties in your ViewModel like this:

We have attached a runnable sample application demonstrating this approach as well.


Regards,
Giuseppe
the Telerik team