private void Table_OnCellPointerPressed(object? sender, DataGridCellPointerPressedEventArgs e)
{
    if (e.Column is DataGridTextColumn col &&
        col.Tag?.ToString() == "SplitLength")
    {
        var grid = this.FindControl<DataGrid>("Table");
        if (grid == null) return;

        grid.SelectedItem = e.Row.DataContext;

        grid.CurrentColumn = e.Column;

        e.Cell.Focus();

        grid.BeginEdit();

        e.PointerPressedEventArgs.Handled = true;
    }
}

private void Table_OnCellPointerPressed(object? sender, DataGridCellPointerPressedEventArgs e)
{
    if (e.Column is DataGridTextColumn col &&
        col.Tag?.ToString() == "SplitLength")
    {
        var grid = this.FindControl<DataGrid>("Table");
        if (grid == null) return;

        grid.SelectedItem = e.Row.DataContext;

        grid.CurrentColumn = e.Column;

        e.Cell.Focus();

        grid.BeginEdit();

        e.PointerPressedEventArgs.Handled = true;
    }
}