We have made a lot of fixes and improvements to the element positioning mechanism in RadComboBox and its helper methods since Q1 2009. Even if manage to trace the changes in the code back to a year ago through all the Qs, we cannot guarantee that applying them to your version will actually work and not create unnecessary complications/side effects.
Please consider upgrading to the most recent version as this really is the best option in this case.
the Telerik team
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