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How to properly construct text boxes with lookup buttons to get information

I have a C# winform with server lookup buttons. For each lookup button there is a matching text box. There is a leave event attached to each text box.Using the first one as an example:

txtProjectNumber has a leave event that calls a method to query the database and get information related to the job specified.
Now if I click the project lookup button I want it to provide a lookup box of potential job numbers.

The problem I have is that since the lookup button moves the focus off the project text box, the project text box leave event fires.
Is there some way I can have the leave event sense that the project lookup button was clicked and not fire?
C#Visual Basic.NET.NET Programming

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8/22/2022 - Mon