# Showcase

The flagship XWUISpreadsheet demo. It walks through live SUM / multiplication formulas evaluated by the built-in engine, frozen header and first-column panes with currency-formatted roster data, and a three-tab workbook where the Summary sheet reads totals from Q1 and Q2 via cross-sheet formulas.

Each grid mounts into an explicitly-sized host div, since the spreadsheet fills 100% of its container's height.