public void OpenGuidePopup() { IconCanvasGuidePopup guidePopup = new IconCanvasGuidePopup(); guidePopup.Callback += (float val, IconCanvasGuideType type) => { IconCanvasGuide.AddGuide(val, type); }; PopupWindow.Show(new Rect(rulerSize + 5f, toolbarHeight + rulerSize + 5f, 0, 0), guidePopup); }