Question : capturing .net application tab event

I have this application that is divided into tabs, each representing a particular business function. TabA has a date field that is later used by TabB. I want to generate a message box if the user forgets to fill in the date field in TabA and then proceeds to click on TabB...is there a way to capture this event...the same way one can validate a textbox when the .leave event is fired
eg (private void textbox1_Leave(object sender, System.EventArgs e))...thanks.
 

Answer : capturing .net application tab event

Is the target form already open?  If not, then create an instance:

    FormX frmX  = new FormX();
    frmX.Show();

Otherwise you'll need a reference to the already open form so you can bring it to the front and focus it...