Generate a signal when the ComboBoxText is clicked.

I am writing a simple GUI, in which I have a ComboBoxText. I write a log
message when ever the user clicks on the ComboBoxText. 
I have tried almost all the button release and popup signals but no results.
The only thing which works is signal_changed() but I don't not need that.
Please help me, below is my sample code :


and here is the call back function:

bool ComboBoxText::ComboInput(GdkEventButton *pEvt) {

    // Here do the desired stuffs !!
    return false;

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