Update:
I managed to fix the first issue by setting the "ClipValueToMinMax" property to true. I'm still not sure why this wasn't the default.
I'm still having trouble with the second issue though, and would really appreciate some help. I don't understand why it looks so broken. The default context menu on the normal TextBox control looks fine - it's only broken, with the first item indented, on the xctk:IntegerUpDown control. I tried replacing the context menu with a custom one, and it's still broken there. Incidentally, I noticed that if I use the same custom context menu on the regular TextBox control, then right-clicking on the xctk:IntegerUpDown control breaks the context menu everywhere, even on the regular TextBox.
Any ideas? I've tried removing styles and looking at the template and I'm stuck.
I managed to fix the first issue by setting the "ClipValueToMinMax" property to true. I'm still not sure why this wasn't the default.
I'm still having trouble with the second issue though, and would really appreciate some help. I don't understand why it looks so broken. The default context menu on the normal TextBox control looks fine - it's only broken, with the first item indented, on the xctk:IntegerUpDown control. I tried replacing the context menu with a custom one, and it's still broken there. Incidentally, I noticed that if I use the same custom context menu on the regular TextBox control, then right-clicking on the xctk:IntegerUpDown control breaks the context menu everywhere, even on the regular TextBox.
Any ideas? I've tried removing styles and looking at the template and I'm stuck.