Now if you add a content to the panelbar the content inside will receive tab navigation only once due to the items control nature of the control. The XAML team has recently reviewed the status of this issue and won't be addressing it in future releases. In order to make the content (items) of a specific RadPanelBarItem (X) focusable with tabKey, set TabNavigation="Local" on X.
The IsTabStop is set to false in all RadPanelBarItems and set to true in the textboxes in the Items of the PanelBarItems. When tab navigating the RadPanelBarItems get focused, in Silverlight they don`t.
Second level items cannot be styled to look like first level items. DECLINED: SecondLevelItemsStyledLikeTopLevelItems SDK sample showing approach to styling PanelBar with more than two levels of PanelBarItems is available since R3 2016 Official Release. https://github.com/telerik/xaml-sdk/tree/master/PanelBar
Update the ExpandMode property to allow zero, one or zero, one ,and multiple expanded items.
When using the new DragDrop logic in the RadPanelBar control, the MouaseOver state of a dragged item isn't cleared on drop. This is why as soon as you move the mouse over another item and start dragging it, you get two PanelBarItems in MouseOver state in the PanelBar.
PanelBar: A custom template can not be set to a PanelBarItem, using a ControlTemplate DECLINED: This issue is not reproducible with 2016 R3 official release.
RadPanelBaritem's expander arrow should not be visible when there are no subitems. XAML Team has recently reviewed the status of this item. It is considered a design limitation of the RadPanelBar control which won't be addressed in future releases. However, users will be able to use the ExpanderStyle property of the RadPaneBarItem (from Q1 2016 SP) in order to control the arrow's visibility.
Implement IsExpandOnDblClickEnabled logic
ExpandAll/Collapse issues, Child RadPanelbarItem is resized incorecctly
PanelBarItem with no Items is initially expanded when its IsExpanded property is data bound
If the RadPanelBar Orientation is Horizontal, a RadHtmlPlaceHolder cannot be displayed inside a RadPanelBarItem
Cannot dynamically change the theme of the control.
Setting a RadGridView element instance as content for a RadPanelBarItem, causes the RadGridView to not show all of its columns.
As a workaround to this, you could set the IsScrollViewerInsideItemsEnabled property of the RadPanelBar element, to True, and you could control the expanded length of the PanelBarItem which holds the RadGridView instance. This could be done by utilizing the ExpandedLength property.
When using an ItemContainerStyle on the second(non-root) BarItems, the Background doesn`t apply
When a control is nested in a RadPanelItem, it is wrapped in another RadPanelBarItem. The DataContext of the second level item is not inherited correctly. As a workaround, you can bind directly to the element which holds the DataContext with an ElementName binding.
When the RadPanelBar is oriented Horizontally , The ScrollViewer does not work when the mouse wheel button is used.
Exception is thrown in the designer when threre are many items in the PanelBar control.