[ncl-talk] Some question about annotation pictures

[半个丑角]

Hello,
      Just now I drew a xy plot picture with another small view annotate to it, but I found that the first plot's axis get throught the tickmark of the smaller one (as shown in the figure). To make it looks more comfortable, I want to add background to the tickmark. But I can't find any resources like txBackgroundFillColor in NCL website.
      Can you give me some advice? 
      Best wishes!
 Lucky
 2018.11.29
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