# MgGrid — Fullscreen & Rendering

> Part of the MgGrid system. See `README.md` for overview and component hierarchy.

## Fullscreen Mode

Two modes depending on whether `MgGridWithInfoPanel` wraps the grid:

| Scenario | Behavior |
|---|---|
| **With wrapper** | `ToggleFullscreen()` delegates to wrapper — fullscreen includes grid + InfoPanel |
| **Standalone** | Grid renders its own `mg-fullscreen-overlay` with header (Caption + close button) and body |

## Rendering

`BuildRenderTree` uses manual render tree building (not Razor markup):

1. Outer `CascadingValue<IMgGridBase>` — provides this grid as `ParentGrid` to children
2. If standalone fullscreen: `div.mg-fullscreen-overlay` > `div.mg-fullscreen-header` + `div.mg-fullscreen-body` > `base.BuildRenderTree`
3. If normal: `div[style=display:contents]` > `base.BuildRenderTree`
4. `_gridRenderKey` (Guid) used as element key — changed by `ForceRenderAsync()` to force re-initialization