We have closed this ticket because another page addresses its subject:
SystemModules - The Save and Cancel Actions are not available when a List View is displayed in ListViewAndDetailView modeIt's necessary to do the following:
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In Windows Forms applications, you can make a List View editable or display it in ListViewAndDetailView mode, when a Detail View is shown next to a List View, representing the currently selected object. Previously, to commit changes made to an object, you had to select another object in the List View or move focus to another place on the form. Additionally, you couldn't cancel your changes. We've changed this behavior. Now, the Save, SaveAndClose and Cancel Actions are available, when you can edit objects in a List View. However, you can switch to the previous behavior by setting the WinDetailViewController's AutoCommitListView property to true.
Thanks, Mary.