Support IsVisible property for columns

[Soar360]

Currently, there is no straightforward way to dynamically hide or show a column in TreeDataGrid. It would be very useful if each column supported an IsVisible property (similar to the pattern used in other UI frameworks), so columns could be hidden or shown at runtime without needing to remove and re-add them from the Columns collection. This would greatly improve flexibility and usability, especially for dynamic UI scenarios.

Request:

• Add an IsVisible property (or similar) to the column definitions in TreeDataGrid.
• Ensure that changing this property at runtime updates the UI accordingly.

Use case:
Dynamically hiding/showing columns based on user preferences, permissions, or application state.

Thank you!