Gets or sets the path to a Boolean value on the source task item to serve as the task milestone indicator, or null to indicate that the milestone indicator is not provided by the source task item. A completed task has its completed effort value equal to effort. This is a dependency property.

[BindableAttribute(true)]
public string IsCompletedMemberPath { get; set; }

<BindableAttribute(True)> _
Public Property IsCompletedMemberPath As String