LT-22572: Add IsDisposed check

[mark-sil]

This change also fixes these defects:
LT-22573
LT-22574

The regression was introduced with Commit fd245f0.

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   10m 57s ⏱️ -12s
4 313 tests ±0  4 240 ✅ ±0  73 💤 ±0  0 ❌ ±0 
4 322 runs  ±0  4 249 ✅ ±0  73 💤 ±0  0 ❌ ±0 

Results for commit 86e7c41. ± Comparison against base commit 7176e6c.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 33.02%. Comparing base (7176e6c) to head (86e7c41).

Files with missing lines	Patch %	Lines
Src/xWorks/XWorksViewBase.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1026      +/-   ##
==========================================
- Coverage   33.02%   33.02%   -0.01%     
==========================================
  Files        1202     1202              
  Lines      278232   278232              
  Branches    37169    37169              
==========================================
- Hits        91889    91887       -2     
  Misses     158495   158495              
- Partials    27848    27850       +2     

Files with missing lines	Coverage Δ
Src/xWorks/XWorksViewBase.cs	30.40% <0.00%> (-0.24%)	⬇️

... and 1 file with indirect coverage changes

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[jasonleenaylor]

@jasonleenaylor reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on mark-sil).