Hello,

I'm simply using QwtPlotgrid to draw line on the QwtPlot.
Normally it draw line on the plot properly.

Now I have 2 theme, default and Dark theme. by default when application starts, open into default theme, and grid lines are also looks proper. After if I changed theme to dark then it turns all the application color to black, at this time also grid line looks proper. Now if I switch application to default theme then grid line at the bottoms get hidden, I don't understand why this happening, please check the attachment.

grid line missing.jpg

Thanks