A Grid with complex columns including locking columns and subrows

Same grid, instantiated programmatically from HTML table

Column 1 Column 2 Column 1 Column 4
Column 3 Column 5

Another complex grid instantiated from an HTML table

rowspan=3 colspan=2 rowspan=2 colspan=2 rowspan=2
rowspan=2 Column 3 rowspan=2 Column 5
Column 2 Column 3 colspan=2