易语言自绘选择框源码,自绘选择框,测试消息,重绘_Checkbox,选择框_鼠标移动,初始化,调用旧窗口过程,GetWindowTitle,取位高,取位低,UI_API_SetWindowLong,UI_API_CallWindowProc,UI_EndPaint,UI_BeginPaint,UI_取窗口标题_,SendMessage,UI_TrackMouseEvent