In your main app, declare a bindable public variable myLabelText. You bind the text property of your label to this variable. Then, in your form, you update this variable. You can use a public variable to hold this text but it's much better to work with a singleton class to hold all global variables.
Can you help me?
ok, let's do it the easy way:
In your main application, declare the global variable:
public var myLabelText:String
in the component where your label is:
And then, in your popup window, somewhere in a script, write:
Application.application["myLabelText"] = "some message";
Now, the label should update automatically!
It does not work!