public void execCommand(AceCommand command) {
        execCommand(command, null);
    }
Execute a command with no arguments. See {@link AceCommand}
values for example.

@param command the command (one of the values in the
               {@link AceCommand} enumeration)
stroom-core-client-widget/src/main/java/edu/ycp/cs/dh/acegwt/client/ace/AceEditor.java