Created Unassigned: Wrong css resource loaded when use inherit class of some ajax control [27821]

Hi,

I need to custom ComboBox control, so i create a class that inherit this control. But i can't use this class because the css resource is loaded is not correct.
Seem that ajaxToolkit use GetWebResourceUrl(control.GetType() ...) that return wrong resource if control.GetType() return wrong project type.

I have work around by adding a ComboBox control to my Controls then remove it.
Do you have any idea to get correct css resource for inherit class of some ajax toolkit control

Thanks