Edited Unassigned: Where is ComboBox predefind theme images? [27855]

Hi.

Where is ComboBox predefind theme images?
Please look at [ASP.NET AJAX Control Toolkit Demos v15.1 / ComboBox Demonstration](http://ajaxcontroltoolkit.devexpress.com/ComboBox/ComboBox.aspx) and change predefined CssClass property.
Images did not load. (Error 404)
http://ajaxcontroltoolkit.devexpress.com/ComboBox/Images/toolkit-arrow.gif
http://ajaxcontroltoolkit.devexpress.com/ComboBox/Images/toolkit-bg.gif
http://ajaxcontroltoolkit.devexpress.com/ComboBox/Images/aqua-arrow.gif
http://ajaxcontroltoolkit.devexpress.com/ComboBox/Images/aqua-bg.gif
http://ajaxcontroltoolkit.devexpress.com/ComboBox/Images/windows-arrow.gif

I have checked latest source codes of Master branch.
Where is below resources in v15.1?
AjaxControlToolkit.SampleSite/ComboBox/Images/toolkit-bg.gif
AjaxControlToolkit.SampleSite/ComboBox/Images/toolkit-arrow.gif
AjaxControlToolkit.SampleSite/ComboBox/Images/aqua-bg.gif
AjaxControlToolkit.SampleSite/ComboBox/Images/aqua-arrow.gif
AjaxControlToolkit.SampleSite/ComboBox/Images/windows-arrow.gif