From the provided description of your requirement you are trying to change the current position of a Pane from code-behind. RadPanes are placed inside RadPaneGroups which on the other hand derives from ItemsControls. So, in order to change the position of a Pane placed inside the PaneGroup you need to implement some custom logic for the Items collection of the PaneGroup. For example the following code-snippet will move the first to index 1:
sender, RoutedEventArgs e)
var itemToMove = paneGroup.Items.GetItemAt(0);
Hope the provided information will be helpful for you.
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