get data min/max for scaling
trying to scale the canvas data
try manually scaling values, get total seconds as X scale
basic chart finally working
try pointset in place of line
improved aspect ratio
Limit to Data.Use=True
Include masked points in display.
start implementing masking Apply button
added Mask and Unmask radio button, need to improve
try to improve radio button performance
bug fix; radiobuttons were being assigned to wrong parent object
lay out radiobuttons within their own vertical sizer
new function ShowMaskingPreview to separate display from validation and updating