allows to define which level of tree must be used for filtering
| level | number | level value, -1 value means the last one |
| show_upper | boolean | enables/disables the "Top Level Show" mode |
Available only in PRO Edition
the show_upper param enables the mode in which the upper level items without children and matching the filtering criteria are still shown, the items situated on the filtration level and below are hidden. More details are given in the article Filtering in TreeGrid.
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