ComponentOne MultiSelect for WinForms
Features / Multi-Selection Mode
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    Multi-Selection Mode
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    MultiSelect provides SelectionMode property to determine whether you can select one or more than one item from the header. This property lets you choose between the following selection modes through SelectionMode enumeration:

    To set the selection mode to multiple, use the following code:

    C1MultiSelect1.SelectionMode = C1.Win.TreeView.SelectionMode.Single
    c1MultiSelect1.SelectionMode = C1.Win.TreeView.SelectionMode.Single;