What is the right way to draw on canvas??

hey..
im making a canvas control like a listbox..
it basically works like this.. there's an Vector in my class, which maintains the list of items which have to be displayed on screen. When the paint() method is called.. everything is re-drawn by looping.
now whenever the add() function is called.. the new string is added to the vector as well and the repaint method is called.
Now the problem i realized is when the canvas is shown on screen, and in the commandAction(..) when the add() method is called in a loop say 20 times .. to add 20 items respectively...
the paint() method is not being called 20 times.. gets stuck at around 18th time..
i dont knw whats the error.. whether calling repaint() method several times is not good or what??
is this a threading issue..?? any better way to make things smoother??

if your calling repaint from a command button it will call it when its ready because repaint() is not syncronised with the command button. check the docs for futher information on this

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