This function should never be used in a window redraw
function (i.e. a function associated to a WM_REDRAW message)
because this function is invoked by EvntWindom() on each
rectangle of the AES rectangle list and the ObjcDraw() function
uses this list too. If you really want draw an object prefer a
window formular or use objc_draw() and the global variable clip
as clipping area:
objc_draw( tree, ROOT, MAXDEPTH, clip.g_x, clip.g_h, clip.g_w, clip.g_h);