How do you set the width of the XamComboEditor popup?

I want to set the width of the the popup of the XamComboEditor so that it will be wider than the control itself --开发者_运维技巧 something like what is described in an Infragistics thread for the XamWebComboEditor. I tried that, just changing the control type, but it didn't work. I explored another option, but didn't quite understand it.

check out my post on the matter. In a nutshell it finds the popup in the DropDownOpening event handler and set its width to the desired value.