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I2C_EVENT hangs

Hi all, I'm using std peripheral library, and it's hangs when I try use I2C_EVENT, for example when I send data

void i2c_transmit(uint8_t byte)
{
I2C_SendData(I2C2, byte);
while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));// here hangs
}

why?
this is my i2c init

void i2c_init()
{
   I2C_InitTypeDef I2C_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB1PeriphClockCmd(I2C2_RCC, ENABLE);
    RCC_APB2PeriphClockCmd(I2C_GPIO_RCC, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00 ;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000 ;
    I2C_Init(I2C2, &I2C_InitStructure);
    I2C_Cmd(I2C2, ENABLE);
}

Can anybody help me?
Best regards