Fix backgroundcolor and ticksbelow error

Fix BackgroundColor and TicksBelow errors in pyside6

added For: Software Platform: Linux Platform: Mac PriorityHigh StatusReview Needed Type: Bug Type: Testing labels

requested review from @maeva and @dkuehn

assigned to @ohosseini

The issues address in this MR (#14 & #15) and two additional issues (#12 (closed) and #13 (closed)) were address in a previous MR (!18 (merged)). I will close this MR.

closed