MQL4 Reference 
Window functions WindowRedraw
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Redraws the current chart forcedly. It is normally used after the objects properties have been changed.
Sample:
//---- set new properties for some objects
ObjectMove(object_name1, 0, Time[index], price);
ObjectSet(object_name1, OBJPROP_ANGLE, angle*2);
ObjectSet(object_name1, OBJPROP_FONTSIZE, fontsize);
ObjectSet(line_name, OBJPROP_TIME2, time2);
ObjectSet(line_name, OBJPROP_ANGLE, line_angle);
//---- now redraw all
WindowRedraw();
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