Hi Vaggelis Charalabakis,
Thank you for contacting us.
At the moment, it will be quite complicated to disable the scrolling of RadMultiColumnComboBox. However, our team took your query into consideration for our next release which is coming soon. So in Q2 2010 we will introduce a ScrollOnMouseWheel event, which you can handle and easily disable the scrolling.
I hope you find this information useful. Let me know if you have further questions.
All the best,
the Telerik team
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