Windows 8.1 scaling causing display problem

I have no problem to use default windows scaling.
But I receive feedback someone cannot view it properly.
He used this application because he claim this can make the application run clearer at 125% scaling


This is the first time I know this app to use windows 8.1 scale also.
Now this is the problem came, now the application that I wrote can't display correctly anymore.
Because it resize the application, so coordinate also went wrong


Sure, for some coordinate I can recalculate using
But drawn element cannot, I take an example to this checkbox.
To draw the tick I am using
The issue is New Point(-5, -3). We can't fit this to every resolution like 100% scale, 125% scale etc.
What should I do?? Please help

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