Center window component

I have create a window component but it will randomly position whether I open its window, x and y positions will only offset the elements, not window. How do I position it to the center of the screen?

Flex 4 (AS3):

private function开发者_JS百科 openDoc():void {
    if (newWindow != null) newWindow.close();
    newWindow = new docwin();
    newWindow.width = 500;
    newWindow.height = 320;
    newWindow.type = "normal";
    newWindow.systemChrome = "standard";
    newWindow.transparent = false;
    newWindow.setStyle("showFlexChrome", true);
    newWindow.showStatusBar = false;
    newWindow.minimizable = false;
    newWindow.maximizable = false;
    newWindow.resizable = false;
    newWindow.open();
}

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Try this:

newWindow.x = Math.ceil((Capabilities.screenResolutionX - newWindow.width) / 2);
newWindow.y = Math.ceil((Capabilities.screenResolutionY - newWindow.height) / 2);

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You can use layout property of window like horizontalCentre and verticalCentre use contstraint based layout scheme

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You have to position the new window with reference to stageWidth and stageHeight properties.

Assuming the origin of your new window is top left, the new location of the the windows will be:

(Stage.stageWidth - newWindow.width)/2, (Stage.stageHeight - newWindow.height)/2;