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DHTMLX Grid : Hide or disable first row's radio button.

Hi,
I want to hide the radio button for the first row in the grid.
How can I achieve this ?

You can change cell type for cell in question 
  <row id="some">
       <cell type="ro"></cell>  // => will be rendered as plain text, not as default column type (radio button)

The same can be done from javascript by grid.setCellExcellType

Hi,
    Using this code shows plain text which  I don't want, we want that whatever state of the radio button is (selected or unselected), it should not change its image of radio button.
    How to do this ?

You can place an image of unchecked radio button into the cell. This image can be found in the codebase/imgs/ folder - "radio_chk0.gif":
<cell type="img">codebase/imgs/radio_chk0.gif</cell>