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DHTMLX Grid : Combine Cells in Grid.

Hi,
I want to have combine cells functionality somewhat similar to MS Excel. How can I achieve this ????

There is no ready to use GUI for such task
Cells can be spaned programmatically, by 
    grid.setColspan(id,index,size)
    grid.setRowspan(id,index,size)

Hi,
     How can I give "size" parameter using blockSelection feature ???

Block selection featrue not purposed for such usage. 
You can get position of block selection, and based on it get necessary dimensions

http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&page=1&q=4172&ssr=yes&s=block%20selection

Hi,
     Is there some way or what do I need to change in the corr JS file so that its not necessary to hardcode the "size" paramter like 2 or 3 instead what number of cells choosen by user?

You can get blockselection params without any additional code modifications. 

var size =  grid._selectionArea.RightBottomCol-grid._selectionArea.LeftTopCol+1;