property command

This property returns the command object. The control box who triggers the CommandEvent can have a command attribute, for example, <button command="myCommand"/>. The value of this command attribute is the id of a command object in a command group. When the control box triggers a CommandEvent, the action associated with the command object is executed. So if a user want to execute a function, he can:

associate the function with a command object and assign the command object's id to the command attribute of the control box

add a reaction for the control box and let it reacts to the CommandEvent

<commandGroup>
    <command id="myCommand" action="doMyCommand();"/>
</commandGroup>
<button label="myButton1" command="myCommand" />
<button label="myButton2" on:command="onCommand();"/>

function doMyCommand()
{
    shell.print("doMyCommand");
}
function onCommand()
{
    shell.print("onCommand");
    var eventObj = shell.currentEvent;
    if (eventObj)
    {
        var commandObj = eventObj.command;
        if (commandObj)
        {
            // if we disable the command object here, this button will not
            // do any action anymore.
            commandObj.disabled = true;
        }
    }
}