Fix(dui3): Use Invoke function instead InvokeAsync

[oguzhankoral]

Reverting the mistake that caused important regression on autocad. TESTED, see gif

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 7.46%. Comparing base (ddccb44) to head (1edcb07).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #223   +/-   ##
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  Coverage   7.46%   7.46%           
=====================================
  Files        239     239           
  Lines       4624    4624           
  Branches     544     544           
=====================================
  Hits         345     345           
  Misses      4264    4264           
  Partials      15      15           

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[JR-Morgan]

This change wasn't an intentional inclusion in #159

Feel free to merge, but I am suspicious that this part of the code has potential for deadlocks and race conditions.
Perhaps we can take a look after the next beta