I used uitextfield by cocos studio, i’m using cocos2d-x 2.2.5. On android,ios,win32 and simulator of windowphone - version 8.0, everything is ok. But when i build on test device, version of it’s 8.1, have some problem. When i use method setMaxLengthEnabled(true) and max is 30 char, uitextfield can insert only 1 char, when i setMaxLengthEnabled(false), i can’t insert any char on it. So sombody can explain why? I build test cpp on test device and have same result. 
Here is my code, call uitextfield from exportJson file:
txtUsername=(UITextField*)layer_login->getWidgetByName(“txtUsername”);
txtUsername->setMaxLength(30);
txtUsername->setMaxLengthEnabled(true);
