Prevent a control panel from blocking the view it corresponds to

[huiwanpnnl]

I posted the issue some weeks ago but probably in a wrong repo: Kitware/trame-colormaps#9. Thanks in advance for your help!

[jourdain]

commit 8c3c8ff (HEAD -> master)
Author: Sebastien Jourdain <sebastien.jourdain@kitware.com>
Commit: Sebastien Jourdain <sebastien.jourdain@kitware.com>

    fix(colormaps): use dialog to prevent data hiding

[huiwanpnnl]

Confirm resolution.