Editor toolbar with a DropDowns tools require extra tab step to focus out

[yanmariomenev]

Describe the bug
When a dropdown tool, such as kendo-toolbar-dropdownlist, is used inside the Editor toolbar, it will require one extra tab to navigate out of the component. The other tools appear to function correctly without any tabbing issues.

To Reproduce

1. Use the tab key to navigate to the content area or directly focus it using the mouse.
2. Then press shift + tab to navigate backwards
3. Two backward tabs are needed to navigate backward from the highlighted component.

https://stackblitz.com/edit/angular-3d8uxu-6pr1mz?file=package.json,src%2Fapp%2Fapp.component.ts