open menu

Question

i have schedule the drawn in c# form, when the form loaded or open the form select data from table and then he draw buttons inside the schedule depends on the data(i mean the time of start and end of the button by the data)
now i want when click on the button i open menu to do many things, add , show ......
how can i program this menu to the buttons which is drawn by selecting as i say before , i mean i did not drag them from Toolbox in visual studio 2010