The RadUpload control does not support the described functionality out of the box. The main reason behind this is that the upload component was not designed to behave as a window or a popup. However, you should be able to implement it with custom code.
To add a close button you can extract the template of the RadUpload control and include an additional button in the StackPanel which holds the Command Area
As for moving the control you can use several approaches depending on your scenario. For example, you can use the DragDropManager
to drag and drop it if necessary. Another thing you can try is to place the control in a Canvas element and when the mouse is pressed on the upload's title you can change the Canvas.Top and Canvas.Left properties.
You can also consider adding the RadUpload control in a RadWindow
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