Currently, the frozen columns' count will be updated if the dragged splitter passes half of the width of the column on which it is over. We could introduce support for modifying this threshold to either increase it or decrease it.

The CellUnloaded event of RadGridView is not invoked consistent compared to CellLoaded. For example, when you scroll up and down, the CellLoaded event is invoked for each new cell that appears in the view port. However, CellUnloaded is not invoked for cells going outside of the viewport.

TreeListView with IsReadOnly True and EnableColumnVirtualization True.
Custom column is defined in code with IsReadOnly False.
Runtime, user edits a cell from the column and then scrolls horizontally - this leads to UI freeze, endlessly.