Thank you for writing.
The desired feature is not support by our RadToolstrip. I would like to inform you we are developing a new control - RadCommandBar - that will replace existing RadToolstrip.
The new control will provide this feature along with the features of the current product (such as horizontal and vertical orientation, drag and drop rearrange, Add/Remove tools, etc.), but will also provide Visual Style Builder support, auto-collapse, and much better design-time support.
I hope this helps.
the Telerik team
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