ComputeDisplayedColumns throws NRE if the first column is freezed and scroll bars are visible

[skindersky-simmakers]

GetPreviousVisibleScrollingColumn returns null and GetEdgedColumnWidth fails

I have slightly changed your sample, you just need to:

• add more rows on Editable tab
• resize window to smaller size
• change horizontal scroll position
• and make several edits to any cells
  DataGridSample.zip

[STRUGAT]

There is a similar problem if you delete columns with visible horizontal scrolling