Provide an item template directive for the ToolBarSplitButton and the ToolBarDropDownButton that allows the customization of their items, similar to the ones available for the default SplitButton and DropDownButton components:  

• https://www.telerik.com/kendo-angular-ui/components/buttons/api/ButtonItemTemplateDirective/ 

Currently, the only way to use this item template is by implementing the default buttons as custom tools in the Toolbar.