treemap highcharts group by -


i have designed treemap using highcharts custom algorithm.it has drilldown 1 level. there drop down chart , has 2 options selection. treemap displayed on basis of dropdown selection has group feature implemented using underscore.js library. feature working fine. problem is, tiles grouped together, placed next each other. requirement : want tiles packed in 1 big tile 1 label. header title in d3(exactly same). please let me know how go it. treemap within treemap? wanted know if feasible have different labels , tooltips parent , children in same treemap. leads helpful.

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