Accordion Collapse panel

[Alexey]

I use "Telerik.UI.for.Blazor 9.1.0" for build Blazor application. And I need to create "Collapse panel" can you sugget me solution using "Telerik.UI.for.Blazor 9.1.0" components. I have researched all available components of the "Telerik.UI.for.Blazor 9.1.0" in source code and documentations (manual) as result I cannot find any mention about "ExpansionPanel" or "Collapse panel" or "Accordion" or other similar panels or components which allow open or Collapse content.

I need to use  "Collapse panel" which will be default close and user could open it. Content of my "Collapse panel" is going to be form inputs or other elements. When user opens "Collapse panel" first time I need to make request for load a lot of data  for my form (inputs, dropdown lists, etc.) in this way I need to show loader/spinner during i try to load and compute my form data.

Key point of the "Accordion Collapse panel" :
1) User can open and close "Accordion Collapse panel";
2) User can set default state of the "Accordion Collapse panel"  - open or close;
3) "Accordion Collapse panel"  has events for open "Accordion Collapse panel"  and close "Accordion Collapse panel"  and other events;
4) For long calculation and computing my "Accordion Collapse panel"  has ability to show loader/spinner;
5) "Accordion Collapse Panel" has some expanded mode which  can allow user only one Accordion Panel item to be expanded at a time or any Accordion Panels can expanded at the same time;

Could you help me with this solution  of the "Collapse panel" ?

[Alexey]

Oh, Sorry if just have found exist and ready solution of Telerik Blazor: https://demos.telerik.com/blazor-ui/panelbar/expanded-modes