To add a template and a command button, you can use this syntax. It is important to note that the click handler is attached to an element with class "k-grid-myCommand that is generated using the string in the Custom method highlighted below:
c.Command(command=>command.Custom("myCommand") .Template("Some text here<a class='k-button k-grid-myCommand'><span class='k-icon k-i-copy'></a>") .Click("function(){kendo.alert('Custom Command')}"));
In case you do not wish to use a template for the custom command, you can just set the text as empty string: