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      How to: Implement Custom Sorting
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      How to: Sort Group Rows by Summary Values
      How to: Obtain the Number of Group Rows Displayed within a View
      How to: Improve Performance when Grouping Data
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      How to: Customize Filter Items within a Column's Filter Dropdown
      How to: Prevent Group Rows from being Collapsed
      How to: Prevent Group Rows from being Expanded
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 End-User Documentation

How to: Prevent Group Rows from being Collapsed

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A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=E2024.

The following example shows how to customize whether a particular group row can be collapsed.

In this example, the 'Status: Invalidated' group row is prevented from being collapsed, and the full collapsing is disabled. To do this, the GroupRowCollapsing event is handled, and the event parameter's Allow property is set to false when the RowHandle property returns the 'Status: Invalidated' row's handle, or an invalid handle (this happens when all group rows are about to be collapsed).

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