Hi Ben Vincent,
Thank you for contacting us.
If the Pane is already floating you will have to use the following code snippet in your event handler to position it.
myPane.ParentOfType<ToolWindow>().HorizontalOffset = 250;
myPane.ParentOfType<ToolWindow>().VerticalOffset = 50;
If the Pane is initially docked and chosen from the menu Floating, you can use the following code:
To set the FloatingSize, which is attached property, it will have to be set before the Pane is floating. That is because, it is meant to be used in XAML.
If you have further questions please feel free to ask again.
the Telerik team
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