The RadComboBox control in Q3 2009 has a brand new base stylesheet
instead of skin file only. This could be a possible breaking change if you use custom skins. You have to set EnableEmbeddedBaseStylesheet to "false"
in order to fix the issues introduced by this change.
In addition, we identified a problem in RTL mode
(dir=rtl) of the combobox.
In order to work correctly in RTL
mode you need to set the following two properties of RadComboBox: