The CommandInfo class has had two additional properites added: objectToEnableOnFault and objectToEnableOnResult. With these you can disable controls that activate events inside their events so a user cannot click the control twice (or technically and entire window or pane) while it is still processing. So inside my handleEvent the first thing I do is say: target.enabled = false (you can also explicity list the control you want to disable with context.mycontrol.enabled = false, but using the control that dispatched the event is cleaner) then before each service call I use code like: var info:MVCServiceInfo = new MVCServiceInfo; info.objectToEnableOnFault = target; That way if an error occurs, gemvc will automatically re-enable the control so you don't have to worry about it. You can also set info.objectToEnableOnResult = target if you want your control automatically re-enabled because your event is complete. Otherwise you add the line at the end of your event before your last service call. Sometimes you may have to set target.enabled = true yourself at the end of your event as well if you have a case where based upon on a condition you call a service or you just exit. I have seen in my applications where if you select GUI controls too fast errors can result. This is most critical with events that update the db but I have also used it on selection events that change the screen (like filters) because these can cause errors as well if you select them too quick. In order for target.enabled to work you need to make sure that the control you want to disable dispatches the event. Currently, in a combo box, for example, you just say click="dispatchEvent(..)" but now you should say comboboxid.dispatchEvent(...) otherwise you will get the enclosing UIComponent (Canvas, Pane, VBox, etc.) as the target (which is some cases may be a good thing as it is in mine).