For the code you show, click_mouse and clickbutton1 need to be functions, not variables or properties. Based on what you show of their use otherwise it looks like you are not using them properly. What it should involve would be something like...
// an event listener
stage.addEventListener(MouseEvent.CLICK, click_mouse);
// the event handler function for the listener
function click_mouse(evt:MouseEvent):void {
// do stuff
}
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