Hi Pierre,
Please, examine the JavaScript code of the dropdown that is executed in the OnClientCommandExecuting event and if there is code similar to the following one remove it:
//Set the background image to the head of the tool depending on the selected toolstrip item
var tool = args.get_tool();
var span = tool.get_element().getElementsByTagName("SPAN")[0];
span.style.backgroundImage = "url(" + val + ")";
If the problem still persists, isolate it in a sample working project and send it for examination by opening a new support ticket.
Best regards,
Rumen
the Telerik team
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