diff --git a/bin/curvecalc b/bin/curvecalc
--- a/bin/curvecalc
+++ b/bin/curvecalc
@@ -18,7 +18,8 @@ from light9 import Submaster, dmxclient,
 from light9.TLUtility import make_attributes_from_args
 from light9.zoomcontrol import Zoomcontrol
 from light9.curve import Curve, Curveview, Curveset, Curvesetview
-from light9.wavelength import wavelength 
+from light9.wavelength import wavelength
+from light9.uihelpers import toplevelat
 
 class Music:
     def __init__(self):
@@ -222,7 +223,7 @@ def subterm_adder(master, curveset, subt
 #######################################################################
 root=tk.Tk()
 root.tk_setPalette("gray50")
-root.wm_geometry("1120x850")
+toplevelat("curvecalc",root)
 root.tk_focusFollowsMouse()
 
 parser = optparse.OptionParser()