My code is as below

            <igOutlookBar:OutlookBarGroup Header="All Requests"
                                          LargeImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20All%20Requests.png"
                                          SmallImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20All%20Requests.png"
                                          IsSelected="{Binding Is_igOutlookBar_AllRequestsSelected}">

I have 3 outlookbargroup defined withing "XamOutlookbar". My selections are not retrieved sometimes. For example,

I have the following three outlookbargroup

<igOutlookBar:XamOutlookBar Grid.Column="0"
                                    Grid.Row="0"
                                    Grid.RowSpan="2"
                                    IsMinimized="{Binding OutlookBarExpansion, Mode=TwoWay}"
                                    Background="#FF9CAAC1"
                                    BorderBrush="#FF9CAAC1"
                                    Foreground="#FF9CAAC1"
                                    OpacityMask="#FF9CAAC1"
                                    VerticalSplitterLocation="Right">
            <igOutlookBar:OutlookBarGroup Header="My Requests"
                                          LargeImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20My%20Requests.png"
                                          SmallImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20My%20Requests.png" 
                                          IsSelected="{Binding Is_igOutlookBar_MyRequestsSelected}">
                <mvvm:CommandBehaviorCollection.Behaviors>
                    <mvvm:BehaviorBinding Command="{Binding outlookBarItemClick}"
                                          CommandParameter="My Requests"
                                          Event="MouseLeftButtonDown"></mvvm:BehaviorBinding>
                </mvvm:CommandBehaviorCollection.Behaviors>
                
            </igOutlookBar:OutlookBarGroup>
            <igOutlookBar:OutlookBarGroup Header="Tasks"
                                          LargeImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20Tasks.png"
                                          SmallImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20Tasks.png"
                                          IsSelected="{Binding Is_igOutlookBar_TasksSelected}">
                
                <mvvm:CommandBehaviorCollection.Behaviors>
                    <mvvm:BehaviorBinding Command="{Binding outlookBarItemClick}"
                                          CommandParameter="Tasks"
                                          Event="MouseLeftButtonDown"></mvvm:BehaviorBinding>
                </mvvm:CommandBehaviorCollection.Behaviors>
 
            </igOutlookBar:OutlookBarGroup>
            <igOutlookBar:OutlookBarGroup Header="All Requests"
                                          LargeImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20All%20Requests.png"
                                          SmallImage="/ToolTimeScheduler;component/Resources/Images/Outlook%20All%20Requests.png"
                                          IsSelected="{Binding Is_igOutlookBar_AllRequestsSelected}">
                <mvvm:CommandBehaviorCollection.Behaviors>
                    <mvvm:BehaviorBinding Command="{Binding outlookBarItemClick}"
                                          CommandParameter="All Requests"
                                          Event="MouseLeftButtonDown"></mvvm:BehaviorBinding>
                </mvvm:CommandBehaviorCollection.Behaviors>
            </igOutlookBar:OutlookBarGroup>
 
        </igOutlookBar:XamOutlookBar>

If suppose my default selection is "All Requests" and when I click on "Tasks", the value for the property, Is_igOutlookBar_TasksSelected, in viewmodel 

changes but the selection is not reflected in view sometimes; it works sometimes.

Do I need to specify the "IsSelected" property as follow or is there anything I am missing?

IsSelected="{Binding Is_igOutlookBar_MyRequestsSelected, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}

Thank you! :)