public function execCommand(cmd:String, ui:Boolean, val:mixed, a:Object):Boolean
Executes a command on the current instance. These commands can be TinyMCE internal commands prefixed with "mce" or they can be build in browser commands such as "Bold". A compleate list of browser commands is available on MSDN or Mozilla.org. This function will dispatch the execCommand function on each plugin, theme or the execcommand_callback option if none of these return true it will handle the command as a internal browser command.
|cmd||String||Command name to execute, for example mceLink or Bold.|
|ui||Boolean||True/false state if a UI (dialog) should be presented or not.|
|val||mixed||Optional command value, this can be anything.|
|a||Object||Optional arguments object.|
Boolean True/false if the command was executed or not.