How to find a specific widget in Tk/grid

Ruby
1

Hi all,

I create a 2-D checkbuttons in the root window using grid.
How do I get the information of a specific widget, let say the widget
located at row=0, column=0, after I press either one of the widget?

Thanks,

#########################

rows is an array of array

@chk_bts=[]# contain all checkbuttons in the interface one
row=0
column=0
count=0
rows.each do |r|
r.each do |e|
@chk_bts<<TkCheckbutton.new(@root) do
text e
if count==0
font TkFont.new(‘times 14 bold’)
else
font TkFont.new(‘times 11 bold’)
end

    grid(:row=>row,:column=>column)
    anchor 'nw'
    width 15
    wrap 150
    relief "raised"
    justify 'left'
    activeforeground 'red'
  end
  count+=1
  column+=1

end
count=0 #reset counter
column=0 #reset the column
row+=1
end

@chk_bts.each do |c_bt|
c_bt.command{
# how to get the info about widget at 0,0 position in the grid
# after I press either of the checkbutton?
}
end