AxCWIMAQ.AcquiredImage() event not firing in C#

[Ritesh2010]

AxCWIMAQ.AcquiredImage() event is not firing in C# even when the following has been set

 

AxCWIMAQ.Enabled = true;

AxCWIMAQ.AcquiredImageEnabled = true;

AxCWIMAQ.AcquiredImageEnabled = true;

The vent handler has been added like :

AxCWIMAQ.AcquiredImage += new NationalInstruments.CWIMAQControls._AxDCWIMAQEvents_AcquiredImageEventHandler(CWIMAQ1_AcquiredImage);

Do i need to set any other property as well. 

Kindly help

Thanks in advance

Ritesh