On demand color set of rows in SmartClient (TreeGrid) -

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I have a tree grid in the SmartClient. Now I can change the lines of some lines like Line Number 3-5, 7-11 etc. Want to I am using an external button that passes the value of the smartclient. Can anyone tell me how to do that? A button value is passing and it is working fine. But the problem is, where can I find the value in the SmartClient and how I will paint the set of lines. Since tree grid is a list grid, I think that you can override the getCellStyle function and change the colors.

Then basically in the pseudo code: 

  if (line> = 3 and row & lt; = 5) Return "style1" if (              html>

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