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The Form Preview groupbox appears on the Theme designer's Ribbon menu.

The following table describes each item inside the Form Preview:
| Item | Description |
|---|---|
| BTP Editor | Preview current theme applied to C1Controls (C1FlexGrid, C1Schedule, C1TrueDBGrid) in a C1RibbonForm. This opens in a new window. This feature is only available in .NET Framework. |
| Auto Preview | Preview current theme applied to C1Controls (C1FlexGrid, C1Schedule, C1TrueDBGrid) in a WinForms with C1Command UI elements. This opens in a new window. |
| Command UI | Preview current theme applied to various C1Controls (C1TrueDBGrid, C1FlexGrid, C1Schedule) with C1Command menu and other UI elements. |
| Ribbon UI | Preview current theme applied to various C1Controls (C1TrueDBGrid, C1FlexGrid, C1Schedule) with a Ribbon-based UI. |
| Input (C1Command UI) | Preview current theme applied to various C1Input controls with C1Command menus and other UI elements. |
| Input (C1Ribbon UI) | Preview current theme applied to various C1Input controls with a C1Ribbon-based UI. |
| RadialMenu | Preview current theme applied to a C1RadialMenu. This feature is only available in .NET Framework. |
| GanttView | Preview current theme applied to a C1GanttView. |
| Report | Preview current theme applied to C1Report print preview controls. This feature is only available in .NET Framework. |
| SuperTooltip | Preview current theme applied to C1SuperTooltip and C1SuperLabel. |
| PrintPreview | Preview current theme applied to PrintPreview. |
| WinForms Controls | Preview current theme applied to standard WinForm controls. |
| CalendarView | Preview current theme applied to a CalendarView. |
| DashboardLayout | Preview current theme applied to a DashboardLayout. |
| DataFilter | Preview current theme applied to a DataFilter. |
| ExpressionEditor | Preview current theme applied to a ExpressionEditor. |
| FlexPivot | Preview current theme applied to a FlexPivot. |
| FlexViewer | Preview current theme applied to a FlexViewer. |
| Gauge | Preview current theme applied to a Gauge. |
| Map | Preview current theme applied to a Map. |
| Ribbon UI | Preview current theme applied to a Ribbon UI. |
| RulesManager | Preview current theme applied to a RulesManager. |
| ScrollBar | Preview current theme applied to a ScrollBar. |
| Sparkline | Preview current theme applied to a Sparkline. |
| TreeView | Preview current theme applied to a TreeView. |
| TileView | Preview current theme applied to a TileView. This feature is only available in .NET Framework. |