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Populate column values after adding new row

Currently i have a grid with 4 columns and the first column contains a checkbox. After adding a new row, how do i add a checkbox or input tag to that column? And how do i add a new row as the first row of the grid? Thanks for the help in advance!

If you have defined column as checkbox
     grid.setColTypes("ch,ed,ed,ed");
The related column in new row will be a checkbox. 

To add row at necessary position 3rd parameter of addRow can be used
   grid.addRow(id,values,0); // add as first row in grid

The "values" variable is an array of values? I want to enter empty strings into all the columns except for the checkbox column. In the checkbox column, the checkboxes were inserted by <input> tags in my Java file by using CData method. How do i enter html tags into the checkbox column? How can the "values" variable know where to place what?

>>The "values" variable is an array of values? 
It can be a comma separated list or an array. 
grid.addRow(id,"1,2,3")
or 
grid.addRow(id,["1","2","3"])

>>How can the "values" variable know where to place what?
The data mapped to related column , first element of array to first column of grid, second to second , etc. If you need to enter data in first column you can define only first element of array. 

grid.addRow(id,["<input type='checkbox' />"]);

By the way , if you are using "ch" column type, you need not define any HTML tags, grid will automatically render checkbox for such cells, the 0 as value will result in unchecked checkbox, 1 as value - checked checkbox

I am using my own checkbox, but if i use the inbuilt "ch" is there anyway i can rename the checkbox name and id? As i would need to do some validation with it. Btw, the html code worked for the addRow.

>>but if i use the inbuilt "ch" is there anyway i can rename the checkbox name and id
The checkboxes created for "ch" column are nameless and can be accessed only through grid's API

Thank you, you have been very helpful. I think i will have to use my own <input> tag for the checkboxes.