I have a Bootstrap or Material based theme created from the ThemeBuilder. When I add it to my application I have noticed that the ShowInEdit property of the GridCommandButtons does not work as expected. 

<AdminEdit>

This is due to the lack of the k-hidden class. In order to solve the issue, you could add the following CSS rule to your <filename>.css file.

CSS:

    .k-hidden {
        display: none;
    }

</AdminEdit>