I am currently using PanelBarBinding.ContentTemplate in conjonction with RenderTreeBuilder and I am able to have different content per panel.

My problem is when I close one of the panes, it removes itself from the DOM. Please provide a way to keep the panes in the DOM (at least when open once) like the PersistTabContent feature of TelerikTabStrip.

Currently, the PanelBar does not have a concept for selection. When I click on an item, it looks like "selected" due to the background but there is no way I can save that selection or set it programmatically if I need to retrieve the selected state at some point.

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ADMIN EDIT

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For the time being, you can use the OnItemRender event and some custom CSS to visually mark the desired item as selected: https://blazorrepl.telerik.com/GobwQhly107nUDoZ51.

If you need to get the item that the user last "selected", you can use the OnItemClick event as we mark the item as selected when the user clicks on it.