Status Bar drawing over border
Office 2016 Colorful - Turn size grip on/off it will draw over top of border sometimes. Also sometimes when it's drawn correctly dragging/resizing form causes it to start drawing wrong.
Other things I noticed that I don't care about, just FYI
SizeGrip
Caramel, Coffee, DarkSide, GlassOceans, iMaginary, Lilian, LiquidSky, LondonLiquidSky, MoneyTwins, Pumpkin, Springtime, Valentine, Xmas, All Office 2007
With size grip turned on when loading skin, it initially draws a right side edge. Turn it off then on and the line disappears and won't draw until window loses and regains focus or is moved/resized
Right Aligned Text
This might be as designed, but SizeGrip always draws over the top of right aligned text. Currently work around it by putting a blank panel on the right.
screenshot
Similar issue in .net while back
https://www.devexpress.com/Support/Center/Question/Details/T321347/ribbonstatusbar-the-right-border-is-not-shown-with-the-office-2016-skin
Thank you for sharing your sample project! I have reproduced this drawing behavior with our Size Grip element and forwarded this ticket to our developers for research.