Hi Stefano Cadò,
Thank you for writing.
Actually, by default, the RadToolStrip items set their size according to their content. So, if you have an image button element with 30x30 image, RadToolStrip will increase its size to handle the bigger bitmap. If you want to put some additional space between the button elements you can use Padding
property. And if you prefer to set some fixed minimal size you can do it through ToolStrip item's MinSize
I hope this helps, let me know if you have any other questions.
the Telerik team
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