RadTreeView is applying multiple selection when left-mouse button is down?

[Adnan]

I upgraded my Telerik version from 2014.1.331.45 to 2016.2.606.45. RadTreeView Multiple selection mode was working just fine with the older version, multiple selection is applied only when using Ctrl and/or Shift key (as expected). But after upgrading, RadTreeView is applying multiple selection without clicking Ctrl or Shift key, which is strange. The code is the same before and after upgrading:

<telerik:RadTreeView x:Name="lstVariables" Padding="5" BorderThickness="0" Grid.Row="0" ScrollViewer.CanContentScroll="False" IsEditable="True" SelectionMode="Multiple" ItemsSource="{Binding LstAppDataSeriesGrouping}" IsDropPreviewLineEnabled="False" IsDragPreviewEnabled="True" IsDragTooltipEnabled="False"  telerik:TreeViewSettings.DragDropExecutionMode="New" IsLineEnabled="True" IsSingleExpandPath="False" IsExpandOnSingleClickEnabled="True" IsDragDropEnabled="True"
KeyDown="lstVariables_KeyDown" ItemTemplateSelector="{StaticResource ItemDataTemplateSelector}">
                            <telerik:RadContextMenu.ContextMenu>
                                <telerik:RadContextMenu x:Name="radContextMenu"  Opened="radContextMenuBasic_Opened">
                                    <telerik:RadMenuItem x:Name="mnuEditVariableBasic" Height="23" Header="{Lang:LangCheck Edit}" Click="EditBasicVariable_Click">
                                        <telerik:RadMenuItem.Icon>
                                            <Image Source="{DynamicResource editseries}"/>
                                        </telerik:RadMenuItem.Icon>
                                    </telerik:RadMenuItem>
                                    <telerik:RadMenuItem x:Name="mnuDelete" Height="23" Header="{Lang:LangCheck Delete}" Click="mnuDeleteBasic_Click">
                                        <telerik:RadMenuItem.Icon>
                                            <Image Source="{DynamicResource delete}"/>
                                        </telerik:RadMenuItem.Icon>
                                    </telerik:RadMenuItem>
                                    <telerik:RadMenuItem x:Name="mnuRename" Height="23" Header="{Lang:LangCheck Rename}" Click="mnuRenameBasic_Click">
                                        <telerik:RadMenuItem.Icon>
                                            <Image Source="{DynamicResource rename}"/>
                                        </telerik:RadMenuItem.Icon>
                                    </telerik:RadMenuItem>
                                </telerik:RadContextMenu>
                            </telerik:RadContextMenu.ContextMenu>
                        </telerik:RadTreeView>

[Petar Mladenov]

Hi Adnan,

Untill Q3 2015 the real Multiple Selection Mode was not implemented in RadTreeView and actually Extended and Multiple modes had the same behavior. We implemented the Multiple selection in Q3 2015 giving you the ability to select and deselect items with mouse. If you still need to use the Extended mode, you need to set the SelectionMode to Extended and your treeview will behave the same way as before.

Just to note that Multiple selection mode is designed and has the same behavior like Multiple mode in RadListBox, RadGridView, RadTileView etc.

You can refer to our documentation article for further reference.

Regards,
Petar Mladenov
Telerik by Progress

[Adnan]

Extended Mode solve my problem, thanks.