changing controls which was created dynamically

Question

in the button click event i have to create three label dynamically and if i double click first label a combobox was create and show with values. the first label will be hidden, then if i select a value from the combobox that value will be placed as the first label content, then again if i double click the first label which is having the combobox value, the same combobox will appear and now the label will be hidden.

i need code for this.......