Update specified text areas without cleaning whole screen?

Hello,

I have graphic elements that add to each other on events. I would like to output and change text according to the status of the graphic elements.

I just want to update the text without clearing the whole screen (because all sequentially created graphic elements would be lost).

How is this possible?

I work with:

  myText2 = new WatchUi.Text({
            :text=>"TEXT",
            :color=>Graphics.COLOR_PINK,
            :font=>Graphics.FONT_LARGE,
            :locX =>WatchUi.LAYOUT_HALIGN_CENTER,
            :locY=>WatchUi.LAYOUT_VALIGN_CENTER

and call with:

myText2.draw(dc);

the graphics I create with pre-defined drawables:

  myshape2= new Rez.Drawables.shape2();

and call with:

myshape2.draw(dc);

Thanks! (may be also small example would be helpful)