Alert doesn't expect to be a child of a Canvas. It has to be popped up. Post a test case of what didn't work.
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of devenhariyani Sent: Monday, December 08, 2008 5:09 PM To: [email protected] Subject: [flexcoders] Getting Null exception when adding an Alert to a Canvas I have an application that has a small 300x300 canvas, and I want to show an Alert that is centered inside of that canvas. I tried passing a parent parameter to Alert.show() method but that did not work, so I was able to get the below code to center the alert inside the Canvas, but the problem is that when a user clicks OK on the Alert, I get a null pointer exception sometimes. Any ideas why i get the exception somtimes, and how to get rid of it?? //app popup alert to parent container var alertMsg:Alert = new Alert(); alertMsg.text = arrErrorMsgs.join("\n\n"); alertMsg.title = "Invalid Feedback Form"; alertMsg.owner = Application.application.cnvFeedback; alertMsg.explicitMaxHeight = 300; alertMsg.explicitMaxWidth = 300; Application.application.cnvFeedback.addChild(alertMsg); -------------------------------------------------------- EXCEPTION --------------------------------------------------------- TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.managers::PopUpManagerImpl/findPopupInfoByOwner()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\managers\PopUpManagerImpl.as:657] at mx.managers::PopUpManagerImpl/removePopUp()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\managers\PopUpManagerImpl.as:366] at mx.managers::PopUpManager$/removePopUp()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\managers\PopUpManager.as:196] at mx.controls.alertClasses::AlertForm/removeAlert()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\controls\alertClasses\AlertForm.as:502] at mx.controls.alertClasses::AlertForm/clickHandler()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\controls\alertClasses\AlertForm.as:541]
