Expand/Collapse Arrow doesn't work anymore. How to fix this?

Sometimes the expand/collapse icon goes out of sync with the expanded state of a node, like this:

The icons should show expanded.

This usually happens when you have defined a read-only (no CellEditingTemplate) template column like this:

  <DataGridTemplateColumn Header="Name">

                            <DataGridTemplateColumn.CellTemplate>

                                <!-- DataContext for the DataTemplates here will be an instance of FlexyNodeData.-->

                                <DataTemplate>

                                    <fxgantt:ExpandableTextBlock Text="{Binding Data, Converter={StaticResource nameConverter}}"></fxgantt:ExpandableTextBlock>

                                </DataTemplate>

                            </DataGridTemplateColumn.CellTemplate>

  </DataGridTemplateColumn>

To fix this issue, include the IsReadOnly property as follows:

<DataGridTemplateColumn Header="Name" IsReadOnly="True">

... in the template.

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