When a content is displayed in TelerikWindow and a TelerikTreeView`s item is expanded, the item`s content is above the window one due to higher z-index.
To fix it, use this CSS:
/* Telerik window content (with z-index 10001) above their animation container (with z-index 10002, used for example in tree view) */Hello,
You can Follow the progress of this issue in the original report here: https://feedback.telerik.com/blazor/1432348-modal-window-is-behind-treeview-items-and-animationcontainer. As a matter of fact, we're working on this at the moment.
Regards,
Marin Bratanov
Progress Telerik