Actionscript :: Keydown Event Reusable Code / Write Once And Use Anywhere In Flex Application

I am new to flex framework.I have created an application using flex framework 4.1 which is having various components that are shown to the end user in the form of a popup window using <mx:TitleWindow>.This titlewindow is closed either on the click of the close button (displayed in it's titlebar) or by pressing the "escape key" on the keyboard.I coded a functionality wherein I close the current TitleWindow whenever an 'escape' button is pressed.Here is what I did.On the keydown event of TitleWindow I called this function.[code]I had to repeat this code for every TitleWindow that I have used in the project.How can I write the above functionality only once and reuse it amongst various TitleWindow and other components so that the code for the same is not repeated across various components? Every TitleWindow that I am using has different code, scripts and layout in it.