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Problem with Tabs : Navigation between cells

Dear Team,
When i use tab key to navigate between the cells, I am getting the Javascript error. the frst row navigation is fine and when i click tab key at the last column of first row. it is not moving to the second row and instead shows the Javascript error :Object doesnt support Property or Method.
Pls assist me in rtesolving this,

Also when i use keymap_excel.js file, the entire tab key based navigation itself doesnt works and i have to click on each cell to enter data.

Pls assist me on this too

Thanks and regards
Ramesh

>>instead shows the Javascript error :Object doesnt support Property or Method.
Which version of dhtmlxgrid are you using ?
The such problem may occurs with some really outdated version of dhtmlxgrid, but in last few builds - there was not such error for sure.
Working sample was sent to your email.

>>the entire tab key based navigation itself doesnt works
Please beware that in such mode grid mimic MS-Excel behaviors, which means - tab key move focus to next cell in row, but will not switch to different row.