detecting if dropdown box is empty and show message

[haplc]

Dear All,

I am using two dropdowns in my VBA code: dropdown 1 and dropdown2.
List of dropdown contains two values A, B
If user select A in dropdown 1, then the list A is shown in dropdown 2
If user select B in dropdown 1, then list B isshown indropdown 2.
If user does not select any value in dropdown 1, then dropdown 2 is also empty

THis is working!
WHat I would like to do is that when user click on dropdown 2 without selecting any value in dropdown 1, then there should be a message saying"please select some valuein dropdown 1".

Thanking you in advance
Best regards

Hussain