Thanks for the reply. I found the issue on my end; however, in trying to setup the ComboBox how my end customer wants it to function, I'm still having problems. I'm sure it's possible, but I can't find the right combination of properties and possible events.
They do not want it to open on focus, but when it has focus they want it to open when they start typing and to be able to see what they are typing. They also want it to toggle from open to close if they click anywhere on the control. If they are typing and select an entry from either a mouse click or an enter key, it will close. Or by navigating away (lose focus) will close it also it.
You could handle PreviewKeyDown event of the ComboBox and PreviewMouseDown event of the TextBox placed inside its template and open the DropDown in the events handlers. In order to subscribe to the events of the TextBox, you can use the TextBoxStyle property.
I have attached a sample project based on the provided code and the additional requirements, please download it and give it a try.
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