Thank you for writing.
If by "dotted vertical line" you mean the grips that are used to move the strip items, then you can hide them using the following code:
strip.Grip.Visibility = ElementVisibility.Collapsed;
If this is not what you want to achieve, I would kindly ask you to provide some more details on what you mean and if possible a screen shot would be very helpful.
the Telerik team
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